Frontier's standups also involve hotel time. Some are actually really nice standups, for example ABQ and OMA, pilots get paid 6Hrs for 2Hrs of flying, 7 hours in a hotel bed, and back in DEN early next morning. Not for everyone though... as several in a row can certainly lead to fatigue.
At Mesa.... well, let's just say that pilots and flight attendants become experts at making beds out of passenger seats. I even recall, some time ago, a Mesa crew (2 pilots, 2 FA's) on a red-eye/standup combo schedule (red-eye flight to YVR, sit for 3 hours, then fly back), having to sleep on the floor of the baggage claim area in Vancouver (they were not allowed to stay on the plane and sleep because of it being an international flight). Just the kind of thing that helps our profession: passengers seeing a crew, in uniform, sleeping on the floor with plane blankets and pillows...