I'm going to visit those 5 zoos (plus 85 more!) this summer. I'll let you know how long I'm at each zoo and I'll try to emulate your times. Or you could just join me...
@snowleopard I seldom get more than two collections done in a day, and more often spend a whole day there whilst judging by some of your trip reports you regularly get three or four polished off per day!
@TeaLovingDave True dat! Although, some of the backwoods, roadside zoos that I've toured in U.S. states like Wisconsin, Michigan and Texas don't deserve much more than an hour of my time. Also, many small aquariums in California charge $5 admission and there are perhaps only a dozen tanks in the facility. I'm sure that you'd spend the exact same amount of time in such places as I do and in some cases I walk around a second time just to ensure that I am there for at least an hour so that I feel as if I've got my money's worth of captive animals.