diff --git a/ci/scripts/r_test.sh b/ci/scripts/r_test.sh
index d5fd78914755e..67142b66dd7fd 100755
--- a/ci/scripts/r_test.sh
+++ b/ci/scripts/r_test.sh
@@ -91,7 +91,9 @@ export TEXMFVAR=/tmp/texmf-var
 BEFORE=$(ls -alh ~/)
 
 SCRIPT="as_cran <- !identical(tolower(Sys.getenv('NOT_CRAN')), 'true')
-  if (as_cran) {
+  # generally will be false, but we can override it by setting SKIP_VIGNETTES=true
+  skip_vignettes <- identical(tolower(Sys.getenv('SKIP_VIGNETTES')), 'true')
+  if (as_cran && !skip_vignettes) {
     args <- '--as-cran'
     build_args <- character()
   } else {
diff --git a/cpp/src/arrow/vendored/datetime/README.md b/cpp/src/arrow/vendored/datetime/README.md
index 89132d9cba0f5..4399191b73724 100644
--- a/cpp/src/arrow/vendored/datetime/README.md
+++ b/cpp/src/arrow/vendored/datetime/README.md
@@ -23,6 +23,9 @@ of the above project.
 The following changes are made:
 - fix internal inclusion paths (from "date/xxx.h" to simply "xxx.h")
 - enclose the `date` namespace inside the `arrow_vendored` namespace
+- fix 4 declarations like `CONSTCD11 date::day  operator "" _d(unsigned long long d) NOEXCEPT;`
+  to not have offending whitespace for modern clang:
+  `CONSTCD11 date::day  operator ""_d(unsigned long long d) NOEXCEPT;` 
 
 ## How to update
 
diff --git a/cpp/src/arrow/vendored/datetime/date.h b/cpp/src/arrow/vendored/datetime/date.h
index c17d6f3f7aa54..1b06182a6daa3 100644
--- a/cpp/src/arrow/vendored/datetime/date.h
+++ b/cpp/src/arrow/vendored/datetime/date.h
@@ -963,8 +963,8 @@ operator<<(std::basic_ostream<CharT, Traits>& os, const year_month_weekday_last&
 inline namespace literals
 {
 
-CONSTCD11 date::day  operator "" _d(unsigned long long d) NOEXCEPT;
-CONSTCD11 date::year operator "" _y(unsigned long long y) NOEXCEPT;
+CONSTCD11 date::day  operator ""_d(unsigned long long d) NOEXCEPT;
+CONSTCD11 date::year operator ""_y(unsigned long long y) NOEXCEPT;
 
 }  // inline namespace literals
 #endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
@@ -1972,7 +1972,7 @@ inline namespace literals
 CONSTCD11
 inline
 date::day
-operator "" _d(unsigned long long d) NOEXCEPT
+operator ""_d(unsigned long long d) NOEXCEPT
 {
     return date::day{static_cast<unsigned>(d)};
 }
@@ -1980,7 +1980,7 @@ operator "" _d(unsigned long long d) NOEXCEPT
 CONSTCD11
 inline
 date::year
-operator "" _y(unsigned long long y) NOEXCEPT
+operator ""_y(unsigned long long y) NOEXCEPT
 {
     return date::year(static_cast<int>(y));
 }
diff --git a/dev/tasks/r/github.linux.cran.yml b/dev/tasks/r/github.linux.cran.yml
index 8f56bf771d224..435e37fc53c46 100644
--- a/dev/tasks/r/github.linux.cran.yml
+++ b/dev/tasks/r/github.linux.cran.yml
@@ -21,20 +21,21 @@
 
 jobs:
   as-cran:
-    name: "rhub/{{ MATRIX }}"
+    name: "rhub/{{ '${{ matrix.config.r_image }}' }}"
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        # See https://hub.docker.com/r/rhub
-        r_image:
-          - ubuntu-gcc12    # ~ r-devel-linux-x86_64-debian-gcc
-          - ubuntu-clang    # ~ r-devel-linux-x86_64-debian-clang
-          - ubuntu-next     # ~ r-patched-linux-x86_64
-          - ubuntu-release  # ~ r-release-linux-x86_64
+        config:
+          # See https://r-hub.github.io/containers/
+          - { r_image: "ubuntu-gcc12" }  # ~ r-devel-linux-x86_64-debian-gcc
+          - { r_image: "ubuntu-clang" }  # ~ r-devel-linux-x86_64-debian-clang
+          - { r_image: "ubuntu-next" }  # ~ r-patched-linux-x86_64
+          - { r_image: "ubuntu-release" }  # ~ r-release-linux-x86_64
+          - { r_image: "clang20", skip_vignettes: true }  # ~ r-devel-linux-x86_64-fedora-clang
     env:
       R_ORG: "rhub"
-      R_IMAGE: {{ MATRIX }}
+      R_IMAGE: {{ '${{ matrix.config.r_image }}' }}
       R_TAG: "latest"
       ARROW_R_DEV: "FALSE"
     steps:
@@ -46,7 +47,7 @@ jobs:
         env:
         {{ macros.github_set_sccache_envvars()|indent(8)}}
         # setting ARROW_SOURCE_HOME='' here ensures that we use the cpp source copied into tools/
-        run: archery docker run -e ARROW_SOURCE_HOME='' r
+        run: archery docker run -e ARROW_SOURCE_HOME='' -e SKIP_VIGNETTES={{ '${{ matrix.config.skip_vignettes }}' }} r
       - name: Dump install logs
         run: cat arrow/r/check/arrow.Rcheck/00install.out
         if: always()
@@ -57,5 +58,5 @@ jobs:
         if: always()
         uses: actions/upload-artifact@v4
         with:
-          name: test-output-{{ "${{ matrix.r_image }}" }}
+          name: test-output-{{ "${{ matrix.config.r_image }}" }}
           path: arrow/r/check/arrow.Rcheck/tests/testthat.Rout*
diff --git a/dev/tasks/tasks.yml b/dev/tasks/tasks.yml
index 781403f3f86d6..9924d26f4bca6 100644
--- a/dev/tasks/tasks.yml
+++ b/dev/tasks/tasks.yml
@@ -1154,8 +1154,6 @@ tasks:
   test-r-linux-as-cran:
     ci: github
     template: r/github.linux.cran.yml
-    params:
-      MATRIX: {{ "${{ matrix.r_image }}" }}
 
   test-r-macos-as-cran:
     ci: github
diff --git a/r/src/filesystem.cpp b/r/src/filesystem.cpp
index 95f19e4f2f256..d941ce4d3ff23 100644
--- a/r/src/filesystem.cpp
+++ b/r/src/filesystem.cpp
@@ -258,7 +258,7 @@ std::string fs___SubTreeFileSystem__base_path(
 
 // [[arrow::export]]
 cpp11::writable::list fs___FileSystemFromUri(const std::string& path) {
-  using cpp11::literals::operator"" _nm;
+  using cpp11::literals::operator""_nm;
 
   std::string out_path;
   auto io_context = MainRThread::GetInstance().CancellableIOContext();