I run Monterey Flipper Pinball. Average attendance is around 16 players, with about 30 in any given Season. Our Season is 10 Nights long, each night currently consists of playing 4 games. League nights are light on ceremony and heavy on reception, only an hour to 2 depending on smoke breaks to finish League Play.
Huge props to FSPA. They have a great point system that we really enjoy, plus a well fleshed out ruleset.