The most I have ever systematically done is during a weekend-long puzzle competition, with 12 people on my team, we decided that any time someone spent 30 minutes on a problem without making progress they should move to a different puzzle, and if they kept doing that, take their sleep. Dunno how well that translates to a domain where the problems aren’t of known, order-of-magnitude-equal difficulty.
The most I have ever systematically done is during a weekend-long puzzle competition, with 12 people on my team, we decided that any time someone spent 30 minutes on a problem without making progress they should move to a different puzzle, and if they kept doing that, take their sleep. Dunno how well that translates to a domain where the problems aren’t of known, order-of-magnitude-equal difficulty.