In the 41-60 range. Mainly changing regular group roster (growing up, school, marriage, changing relationships, military, moving, divorces, etc.). Played with 2 other groups other than my regular group--1 other when there was a group split (no longer around), & currently running games for another group (which was on hiatus for 2 weeks, but will resume this week).
Highest # of people at the table has been around 12-15 people for 1 session. Herding cats would've been easier.