Glyfair said:
A lot depends on how you count it. I run a game & play in my brothers game (that we alternate) and run a Xen'drik Adventures game at a local game store. All three groups are mostly the same players, with a few slight variations.
Here's how it works for me... Let's identify players by a letter. I'm A, by the way.
Most Friday afternoons DM: A, Players B, C, D, E, F, G - RPGA adventure, either Living Greyhawk, Mark of Heroes or Xen'drik Expeditions (Cabal of Shadows).
Occasional Friday afternoons DM: B, Players A, C, D, E, F, G - XE: Covenant of Light
Fortnightly Friday Night DM A: Players, C, H, I, J, K, L - Age of Worms
Monthly Friday night DM: H; Players A, I, J, M - Mutants & Masterminds
Fortnightly Sunday afternoon DM A; Players B, C, D, M, N, O - Ulek campaign
Monthly Saturday DM: C; Players A, C, D, E - XE: Blackwheel Company
Monthly Sunday DM: A; Players B, C, E, H, P - XE: Crimson Codex
So, that's 16 players split between 7-9 campaigns. I'm not counting the games that I don't play in, the like d20 Modern game that B runs with a couple of players not on the list!
Cheers!