My copy of the Pilot's Bumper Fun guide to String Measurement tells me that it all depends upon experience, aptitude, aircraft type, club/instructor attitude, prices on the Hang Sen and the phases of the moon. 1-2 hrs maybe. More perhaps if the crate is something wacky. Less if you remembered to pack your Joe 90 specs.. .. .As for minimum hours, most clubs don't set a minimum for licensed pilots renting basic fixed gear, fixed prop aircraft but they may do for more complex/expensive types. Have fun taking your check book flying.