If his goal was to use his flight test period for $100 burgers, I
would of course just dismiss him as an idiot.
He was just curious if it was a reg or a DAR preference. While I have
not done a first flight, I have flown time off a plane after rest and
reassembly.
I remember something needing attention after almost every flight. Of
course, around here, aircraft inspection is kind of a spectator sport.
10 eyes is often better than 2. (it takes a village)
Unless I hear differently, it sounds like it is not a FAA requirement,
but possibly a common constraint added by the DAR to the operating
limitations in phase 1.

thanks