Too many factors to consider for a pat answer. Are you staying in a resort close to a park? Do you have little ones? What are you going to do during your break? Swim, nap, watch cartoons? We have been known to leave the park and get back to the room in 15 minutes, put on out swimsuits and spend about 45 min. at the pool, take a shower and be back at a park in 1 1/2 hours. If you are staying at an Epcot resort, no transport required if you are at Epcot or HS so you could do the whole turn around in a hour. Or you could spend 2 hours at the pool, etc. You could be at a bus resort and the bus stop be totally empty and the bus just arrive when you get there. Or you could be at a bus stop and wait 30 min for the bus. Figure at least 2 hours and go from there.