Do you mean actual capacity or "capacity" when the park is actually closed so the business doesn't completely ruin everyones day?Usually at "capacity" I'd say all major coasters at 90-120mins, all/majority of flats from 60-90 mins.At actual capacity, well probably 3 hours for major coasters and 2 for flats.Well that's what I'd guess, but the usual things would effect the queue's like weather, rides available/reliability etc etc.Edit: Silly me, thought this was in the Thorpe sectionFor Chessington at "capacity" 60-90 mins for main rides such as Vampire, Fury, Tomb etc and 60 at most for almost everything else I'd assume.At actual capacity, it's not even worth thinking about