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[xechnao]

I believe that there should be some risky encounters that they could bother players even for two hours. For exaple trying to escape from some castle full of guards where guards are aware and alert and some are even actively searching for you.
Cadwallon by Rackham has explicit rules for using minis in such scenarios if you are interested.
OTOH a simple confrontation should not take more than 10 mins.