If you do put a timed element on puzzles (which I don't think you should), there should be some sort of Pause feature, maybe one that blanks the screen, because I frequently got up to do other things in the middle of puzzles (it was time to switch the laundry, or whatever).
Interestingly, if a puzzle seemed urgent ("Fix this pipe before the hotel fills up with smoke!"), I tried to solve it extra fast, even if there wasn't really a reason to.
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