A simple Google for your title phrase "Map Change Timelimit", gives me this one as the first result:
How do I change the map-change time after the game ends on my server?
So if you tried to search, you would have saved the 56 minutes response time here. ;)
(Also, this isn't really a
Plugin/Gameplay Ideas and Requests topic, but a topic for the
Source Servers (SRCDS) forum, if you are running SRCDS games. Posting in the right / relevant section also helps you solving your questions faster...)
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