Fun thing from a castle-crawl I ran last night: set up a slightly contrived situation where after 2 hours -- in game time *and* real time -- the castle guards would come looking for the party.
This was a soft time limit: they weren't cut off after two hours, but going over would change the situation and make escape more difficult.
Ofc they went over but it really sped up the end of the adventure, made the escape super exciting, and we were able to do the whole thing in <3h total, incl. setup.
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