[CocaKoala]

With the caveat that I haven't done any sessions run by SpeedSF, the description for their AutoX events at Sonoma usually says something like "Show up and drive, we have dedicated course workers, you can expect to have 20-30 runs in a day".

For something run by a group like TrackMasters or GGLC or PCA, then you're definitely correct, you'll have somewhere between five and ten runs depending on how smoothly it goes, you'll work the course for a while, and you should view it as a fun day of hanging out with people who like cars and you'll get to drive a bit.

You're also definitely correct that autocross is a lot of fun and anybody who is interested in driving their car for the joy of it should try it out.