Of course one would want to make sure the gear is in top shape, to fuel up beforehand, and arrive with time for prep and a off-court warm-up.
As for the actual hit, here's a sample plan for a 8pm session:
7:30 Get ready (change, restroom)
7:40 Warm up off-court (move everything)
7:55 Get close to court
8:00 Mini tennis
8:05 Volley to volley
8:10 Baseline-baseline (freestyle, targets, crosscourt, longline, longline-cross, ...)
8:20 Baseline-net (add directions, in motion)
8:30 Serves & returns (targeted)
8:35 5-point TieBreaks, 1 serve only (for more rallies)
8:45 5-point TieBreaks, 2 serves, 1st serve all-out
8:55 Relaxed baseline exchange
9:00 Cool down off-court
I'd definitely bring a bunch of quality balls (min 6?), so that more time is spent on hitting and less on picking up. Especially in the US where a new can costs about as much as a minute of court time in NYC :)