diff --git a/telethon/_updates/messagebox.py b/telethon/_updates/messagebox.py
index 28e41bba..da10100f 100644
--- a/telethon/_updates/messagebox.py
+++ b/telethon/_updates/messagebox.py
@@ -42,7 +42,7 @@ POSSIBLE_GAP_TIMEOUT = 0.5
 # client will resume normal operation, and the timeout will reset.
 #
 # Documentation recommends 15 minutes without updates (https://core.telegram.org/api/updates).
-NO_UPDATES_TIMEOUT = 15
+NO_UPDATES_TIMEOUT = 15 * 60
 
 # Entry "enum".
 # Account-wide `pts` includes private conversations (one-to-one) and small group chats.
diff --git a/telethon/version.py b/telethon/version.py
index 38fe5b63..a8524931 100644
--- a/telethon/version.py
+++ b/telethon/version.py
@@ -1,3 +1,3 @@
 # Versions should comply with PEP440.
 # This line is parsed in setup.py:
-__version__ = '1.25.3'
+__version__ = '1.25.4'