You won't be able to keep a Flight Review or IPC under an hour, since a minimum of an hour flight is required. I'd minimize fluids ahead of time, limit caffeine, eat something with salt, or take a sodium pill, go right before you get in the plane, and if you still can't make it more than an hour, it'd probably be better to be wearing something like a depends than whip out a Gatorade bottle, if at all possible. It's one thing to do that on trips with the family or on your own going to get a $500 hamburger, but on a flight lesson, with an instructor you don't know, feels like that would be a little embarrassing for both of you. I've had folks have to pee in the plane I'm in, but they're usually in the back of it and I just don't turn around. Hard to do that with any privacy or dignity side by side in a 172 or Cherokee or whatever.
Nothing says you can't do two 30 minute flights.
True! Inefficient and probably more time consuming and expensive in the end, counting start up, taxi, run-up, takeoff, getting somewhere, and reversing all that to come back in, twice, just to get a few minutes in of maneuvering each time possibly, but multiple short flights would work too.
