diff --git a/include/trick/Executive.hh b/include/trick/Executive.hh
index a545253e7..5e58a4ef2 100644
--- a/include/trick/Executive.hh
+++ b/include/trick/Executive.hh
@@ -276,6 +276,15 @@ namespace Trick {
             /** S_run_summary - Trick version.\n */
             std::string current_version;            /**< trick_units(--) */
 
+            /** rt_nap statistics - total number of rt_nap that is longer than 10% of the software frame.\n  */
+            int rt_nap_count;                       /**< trick_units(--) */
+
+            /** rt_nap statistics - the longest rt_nap.\n */
+            double longest_rt_nap;                  /**< trick_units(s) */
+
+            /** rt_nap statistics - the shortest rt_nap.\n */
+            double shortest_rt_nap;                 /**< trick_units(s) */
+
             /**
              @userdesc Command to reset job cycle times after the time_tic_value has changed.
              @return void
@@ -875,6 +884,16 @@ namespace Trick {
              */
             int set_current_version(std::string version) ;
 
+            /**
+             @userdesc Set stats after each RELEASE() when rt_nap is true. The stats contains the counts of 
+             RELEASE() if the time delta between before and after RELEASE() is greater than 10% of the 
+             software frame time, the longest delta, and the shortest delta of before and after RELEASE().
+             @param clock_time_before_rt_nap - clock time before RELEASE() is called when rt_nap is true.
+             @param clock_time_after_rt_nap  - clock time after RELEASE() is done when rt_nap is true.
+             @reutnr void
+            */
+            void set_rt_nap_stats(long long clock_time_before_rt_nap, long long clock_time_after_rt_nap) ;
+
             // END GET and SET FUNCTIONS
 
             /**
diff --git a/include/trick/exec_proto.h b/include/trick/exec_proto.h
index d536c79eb..607c16e56 100644
--- a/include/trick/exec_proto.h
+++ b/include/trick/exec_proto.h
@@ -74,6 +74,7 @@ extern "C" {
     int exec_set_version_date_tag(const char * tag) ;
     int exec_set_build_date(const char * date) ;
     int exec_set_current_version(const char * version) ;
+    void exec_set_rt_nap_stats(long long clock_time_before_rt_nap, long long clock_time_after_rt_nap) ;
 
     int exec_freeze(void) ;
     int exec_run(void) ;
diff --git a/trick_source/sim_services/Clock/Clock.cpp b/trick_source/sim_services/Clock/Clock.cpp
index 420ded5ad..020550d6e 100644
--- a/trick_source/sim_services/Clock/Clock.cpp
+++ b/trick_source/sim_services/Clock/Clock.cpp
@@ -84,11 +84,15 @@ long long Trick::Clock::clock_time() {
 */
 long long Trick::Clock::clock_spin(long long req_time) {
     long long curr_time ;
+    long long time_before_rt_nap, time_after_rt_nap ;
     curr_time = clock_time() ;
     /* Perform spin loop to allow current time to catch up to requested time */
     while (curr_time < req_time) {
         if ( exec_get_rt_nap() == 1 ) {
+            time_before_rt_nap = wall_clock_time() ;
             RELEASE();
+            time_after_rt_nap = wall_clock_time() ;
+            exec_set_rt_nap_stats(time_before_rt_nap, time_after_rt_nap) ;
         }
         curr_time = clock_time();
     }
diff --git a/trick_source/sim_services/Clock/test/Makefile b/trick_source/sim_services/Clock/test/Makefile
index fe58b2771..cbbe6c2be 100644
--- a/trick_source/sim_services/Clock/test/Makefile
+++ b/trick_source/sim_services/Clock/test/Makefile
@@ -21,7 +21,7 @@ BASE_OBJECTS = ../object_${TRICK_HOST_CPU}/Clock.o\
                ../object_${TRICK_HOST_CPU}/clock_c_intf.o
 
 
-GETTIMEOFDAY_CLOCK_OBJECTS = ${BASE_OBJECTS} GetTimeOfDayClock_test.o ../object_${TRICK_HOST_CPU}/GetTimeOfDayClock.o exec_get_rt_nap_stub.o
+GETTIMEOFDAY_CLOCK_OBJECTS = ${BASE_OBJECTS} GetTimeOfDayClock_test.o ../object_${TRICK_HOST_CPU}/GetTimeOfDayClock.o exec_get_rt_nap_stub.o exec_set_rt_nap_stats_stub.o
 
 # All tests produced by this Makefile.  Remember to add new tests you
 # created to the list.
@@ -45,3 +45,6 @@ GetTimeOfDayClock_test : ${GETTIMEOFDAY_CLOCK_OBJECTS}
 
 exec_get_rt_nap_stub.o : exec_get_rt_nap_stub.cpp
 	$(TRICK_CXX) $(TRICK_CPPFLAGS) -c $<
+
+exec_set_rt_nap_stats_stub.o : exec_set_rt_nap_stats_stub.cpp
+	$(TRICK_CXX) $(TRICK_CPPFLAGS) -c $<
diff --git a/trick_source/sim_services/Clock/test/exec_set_rt_nap_stats_stub.cpp b/trick_source/sim_services/Clock/test/exec_set_rt_nap_stats_stub.cpp
new file mode 100644
index 000000000..58bc02092
--- /dev/null
+++ b/trick_source/sim_services/Clock/test/exec_set_rt_nap_stats_stub.cpp
@@ -0,0 +1,3 @@
+extern "C" void exec_set_rt_nap_stats(long long clock_time_before_rt_nap, long long clock_time_after_rt_nap) {
+    
+}
diff --git a/trick_source/sim_services/Executive/Executive.cpp b/trick_source/sim_services/Executive/Executive.cpp
index 5b4759a7e..75e49ed41 100644
--- a/trick_source/sim_services/Executive/Executive.cpp
+++ b/trick_source/sim_services/Executive/Executive.cpp
@@ -417,3 +417,19 @@ int Trick::Executive::set_current_version(std::string version) {
 int Trick::Executive::get_except_return() const {
     return except_return;
 }
+
+void Trick::Executive::set_rt_nap_stats(long long clock_time_before_rt_nap, long long clock_time_after_rt_nap) {
+    double rt_nap_elapsed_time = (double)(clock_time_after_rt_nap - clock_time_before_rt_nap) / time_tic_value ;
+    if (rt_nap_elapsed_time / software_frame > 0.1) {
+        rt_nap_count++ ;
+    }
+    if (longest_rt_nap < rt_nap_elapsed_time) {
+        longest_rt_nap = rt_nap_elapsed_time ;
+    }
+
+    if (shortest_rt_nap == 0.0) {
+        shortest_rt_nap = rt_nap_elapsed_time ;
+    } else if (shortest_rt_nap > rt_nap_elapsed_time) {
+        shortest_rt_nap = rt_nap_elapsed_time ;
+    }
+}
\ No newline at end of file
diff --git a/trick_source/sim_services/Executive/Executive_c_intf.cpp b/trick_source/sim_services/Executive/Executive_c_intf.cpp
index 8e88f0c05..861988683 100644
--- a/trick_source/sim_services/Executive/Executive_c_intf.cpp
+++ b/trick_source/sim_services/Executive/Executive_c_intf.cpp
@@ -737,6 +737,17 @@ extern "C" const char * exec_get_current_version() {
     return NULL ;
 }
 
+/**
+ * @relates Trick::Executive
+ * @copydoc Trick::Executive::set_rt_nap_stats
+ * C wrapper for Trick::Executive::set_rt_nap_stats
+ */
+extern "C" void exec_set_rt_nap_stats(long long clock_time_before_rt_nap, long long clock_time_after_rt_nap) {
+    if ( the_exec != NULL ) {
+        the_exec->set_rt_nap_stats(clock_time_before_rt_nap, clock_time_before_rt_nap) ;
+    }
+}
+
 /**
  * @relates Trick::Executive
  * @userdesc Raise a signal on the main thread to terminate the simuation immediately.
diff --git a/trick_source/sim_services/Executive/Executive_loop_multi_thread.cpp b/trick_source/sim_services/Executive/Executive_loop_multi_thread.cpp
index 34e348c1d..cd0b3b69c 100644
--- a/trick_source/sim_services/Executive/Executive_loop_multi_thread.cpp
+++ b/trick_source/sim_services/Executive/Executive_loop_multi_thread.cpp
@@ -6,6 +6,8 @@
 #include "trick/Executive.hh"
 #include "trick/exec_proto.h"
 #include "trick/release.h"
+#include "trick/clock_proto.h"
+#include "trick/Executive.hh"
 
 /**
 @details
@@ -40,13 +42,17 @@ int Trick::Executive::loop_multi_thread() {
     unsigned int ii ;
     Trick::ScheduledJobQueue * main_sched_queue ;
     int ret = 0 ;
+    long long time_before_rt_nap, time_after_rt_nap;
 
     /* Wait for all threads to finish initializing and set the child_complete flag. */
     for (ii = 1; ii < threads.size() ; ii++) {
         Threads * curr_thread = threads[ii] ;
         while (curr_thread->child_complete == false ) {
             if (rt_nap == true) {
-                RELEASE();
+                time_before_rt_nap = clock_wall_time() ;
+                RELEASE() ;
+                time_after_rt_nap = clock_wall_time() ;
+                set_rt_nap_stats(time_before_rt_nap, time_after_rt_nap) ;
             }
         }
     }
@@ -146,7 +152,10 @@ int Trick::Executive::loop_multi_thread() {
                 depend_job = curr_job->depends[ii] ;
                 while (! depend_job->complete) {
                     if (rt_nap == true) {
+                        time_before_rt_nap = clock_wall_time() ;
                         RELEASE();
+                        time_after_rt_nap = clock_wall_time() ;
+                        set_rt_nap_stats(time_before_rt_nap, time_after_rt_nap) ;
                     }
                 }
             }
diff --git a/trick_source/sim_services/Executive/Executive_scheduled_thread_sync.cpp b/trick_source/sim_services/Executive/Executive_scheduled_thread_sync.cpp
index 59f631e27..032095562 100644
--- a/trick_source/sim_services/Executive/Executive_scheduled_thread_sync.cpp
+++ b/trick_source/sim_services/Executive/Executive_scheduled_thread_sync.cpp
@@ -3,6 +3,7 @@
 
 #include "trick/Executive.hh"
 #include "trick/release.h"
+#include "trick/clock_proto.h"
 
 /**
 @design
@@ -12,14 +13,17 @@
 int Trick::Executive::scheduled_thread_sync() {
 
     unsigned int ii ;
-
+    long long time_before_rt_nap, time_after_rt_nap ;
     /* Wait for synchronous threads to finish before testing for adjusting time_tics */
     for (ii = 1; ii < threads.size() ; ii++) {
         Threads * curr_thread = threads[ii] ;
         if ( curr_thread->enabled and curr_thread->process_type == PROCESS_TYPE_SCHEDULED) {
             while (curr_thread->child_complete == false ) {
                 if (rt_nap == true) {
+                    time_before_rt_nap = clock_wall_time() ;
                     RELEASE();
+                    time_after_rt_nap = clock_wall_time() ;
+                    set_rt_nap_stats(time_before_rt_nap, time_after_rt_nap) ;
                 }
             }
         }
diff --git a/trick_source/sim_services/Executive/Executive_shutdown.cpp b/trick_source/sim_services/Executive/Executive_shutdown.cpp
index 9e431eb46..2c91e875b 100644
--- a/trick_source/sim_services/Executive/Executive_shutdown.cpp
+++ b/trick_source/sim_services/Executive/Executive_shutdown.cpp
@@ -125,6 +125,16 @@ int Trick::Executive::shutdown() {
             user_cpu_time, kernal_cpu_time, sim_to_cpu, 
             user_cpu_init, kernal_cpu_init, sim_mem) ;
 
+    if (rt_nap == true) {
+        message_publish(MSG_NORMAL , "\n\n"
+            "         SIMULATION RT NAP STATS\n"
+            "                   RT NAP COUNTS: %17d\n"
+            "  (RT NAP / SOFTWARE FRAME > 0.1)\n"
+            "                  LONGEST RT NAP: %12.15f\n"
+            "                 SHORTEST RT NAP: %12.15f\n",
+            rt_nap_count, longest_rt_nap, shortest_rt_nap) ;
+    }
+
     /* Kill all threads. */
     for (ii = 1; ii < threads.size() ; ii++) {
         if ( threads[ii]->running ) {
diff --git a/trick_source/sim_services/Executive/Executive_thread_sync.cpp b/trick_source/sim_services/Executive/Executive_thread_sync.cpp
index 79022d6c6..a43a546a9 100644
--- a/trick_source/sim_services/Executive/Executive_thread_sync.cpp
+++ b/trick_source/sim_services/Executive/Executive_thread_sync.cpp
@@ -3,6 +3,7 @@
 
 #include "trick/Executive.hh"
 #include "trick/release.h"
+#include "trick/clock_proto.h"
 
 /**
 @design
@@ -22,6 +23,7 @@
 int Trick::Executive::thread_sync() {
 
     unsigned int ii ;
+    long long time_before_rt_nap, time_after_rt_nap ;
 
     /* Wait for async_must finish to complete at the current time_tics */
     for (ii = 1; ii < threads.size() ; ii++) {
@@ -30,7 +32,10 @@ int Trick::Executive::thread_sync() {
               (curr_thread->amf_next_tics == time_tics )) {
             while (curr_thread->child_complete == false ) {
                 if (rt_nap == true) {
+                    time_before_rt_nap = clock_wall_time() ;
                     RELEASE();
+                    time_after_rt_nap = clock_wall_time() ;
+                    set_rt_nap_stats(time_before_rt_nap, time_after_rt_nap) ;
                 }
             }
         }
diff --git a/trick_source/sim_services/Executive/Threads_child.cpp b/trick_source/sim_services/Executive/Threads_child.cpp
index 3a9ac40b9..4b38118cb 100644
--- a/trick_source/sim_services/Executive/Threads_child.cpp
+++ b/trick_source/sim_services/Executive/Threads_child.cpp
@@ -22,10 +22,12 @@
 
 #include "trick/Threads.hh"
 #include "trick/release.h"
+#include "trick/Executive.hh"
 #include "trick/ExecutiveException.hh"
 #include "trick/exec_proto.h"
 #include "trick/TrickConstant.hh"
 #include "trick/message_proto.h"
+#include "trick/clock_proto.h"
 
 
 /**
@@ -41,6 +43,7 @@ static int call_next_job(Trick::JobData * curr_job, Trick::ScheduledJobQueue & j
     Trick::JobData * depend_job ;
     unsigned int ii ;
     int ret = 0 ;
+    long long time_before_rt_nap, time_after_rt_nap ;
 
     //cout << "time = " << curr_time_tics << " " << curr_job->name << " job next = "
     //  << curr_job->next_tics << " id = " << curr_job->id << endl ;
@@ -50,7 +53,10 @@ static int call_next_job(Trick::JobData * curr_job, Trick::ScheduledJobQueue & j
         depend_job = curr_job->depends[ii] ;
         while (! depend_job->complete) {
             if (rt_nap == true) {
+                time_before_rt_nap = clock_wall_time() ;
                 RELEASE();
+                time_after_rt_nap = clock_wall_time() ;
+                the_exec->set_rt_nap_stats(time_before_rt_nap, time_after_rt_nap) ;
             }
         }
     }