In rec.aviation.piloting, on Fri 31 Aug 2007 11:29:55a, "Robert M. Gary"
wrote:

If you like to spend 30 minutes preflighting, reviewing the logs etc,
please consider booking the plane at 4pm and the instructor at 4:30.
That way the instructor can continue with ground instruction or flight
instruction in another airplane while you take your time to prefilght.

If the plane just got back, I figure it's airworthy enough for me and I
would just give it a quick preflight (fuel, oil, and a quick shake to see
if anything falls off). Hell, it's not like we were going to have some
sort of problem and get stuck up there, ya know... By the time that the
instructor had finished reviewing the lesson with the previous student /
taken his money, I was usually ready to go. At the school where I went,
weekends were usually booked solid, so the instructor was going to be there
all day anyway. Of course, the school tended to prefer that the instructor
do all of his instructing when the engine was running so that they could
bill more for it. That's one of the reason that you would see one of their
aircraft sitting in the runup area with the instructor going over
everything they were going to be doing prior to takeoff. It tended to make
it rather inconvenient for cars who were driving to their hangar since
there often wasn't enough room to squeeze around them.