45 min. - an hour is well within reason for us.
The FP era has certain cultivated the "20 minutes and under, ride it once for the day" mentality, but I pre-date that (back in my day, if you wanted to ride Splash Mtn., you waited 2 hours...now get off my lawn!) and we go to the parks for rides and rides ... and more rides. We've done a solid 18 hours in a park. When the FP run out and the park is open for another 8, 10, 12 hours, we'll start lining up to get in as many rides on BTMRR, Splash Mountain, EE, RNRC, ToT, etc. that we can.