diff --git a/nonebot/config.py b/nonebot/config.py
index 99b13b8cead0..535c7942d97d 100644
--- a/nonebot/config.py
+++ b/nonebot/config.py
@@ -461,9 +461,8 @@ class Config(BaseSettings):
 
     用法:
         ```conf
-        SESSION_EXPIRE_TIMEOUT=120  # 单位: 秒
-        SESSION_EXPIRE_TIMEOUT=[DD ][HH:MM]SS[.ffffff]
-        SESSION_EXPIRE_TIMEOUT=P[DD]DT[HH]H[MM]M[SS]S  # ISO 8601
+        SESSION_EXPIRE_TIMEOUT=[-][DD]D[,][HH:MM:]SS[.ffffff]
+        SESSION_EXPIRE_TIMEOUT=[±]P[DD]DT[HH]H[MM]M[SS]S  # ISO 8601
         ```
     """
 
diff --git a/website/docs/appendices/config.mdx b/website/docs/appendices/config.mdx
index 96409a1c4d16..98d6861d0882 100644
--- a/website/docs/appendices/config.mdx
+++ b/website/docs/appendices/config.mdx
@@ -579,13 +579,13 @@ nonebot.init(command_start={"/", ""}, command_sep={".", " "})
 - **类型**: `timedelta`
 - **默认值**: `timedelta(minutes=2)`
 
-用户会话超时时间，配置格式参考 [Datetime Types](https://docs.pydantic.dev/usage/types/#datetime-types)，可以为单位为秒的 `int | float` 等。
+用户会话超时时间，配置格式参考 [Datetime Types](https://docs.pydantic.dev/latest/api/standard_library_types/#datetimetimedelta)。
 
 <Tabs groupId="configMethod">
   <TabItem value="dotenv" label="dotenv" default>
 
 ```dotenv
-SESSION_EXPIRE_TIMEOUT=120
+SESSION_EXPIRE_TIMEOUT=00:02:00
 ```
 
   </TabItem>
@@ -593,9 +593,9 @@ SESSION_EXPIRE_TIMEOUT=120
 
 ```bash
 # windows
-set SESSION_EXPIRE_TIMEOUT '120'
+set SESSION_EXPIRE_TIMEOUT '00:02:00'
 # linux/macOS
-export SESSION_EXPIRE_TIMEOUT='120'
+export SESSION_EXPIRE_TIMEOUT='00:02:00'
 ```
 
   </TabItem>