I've been running games and campaigns since 1989. I've run solo campaigns for one, up to 19 people group mash- ups- took about an hour to resolve each round of combat. It's been D&D, Rifts, AD&D, AD&D second edition, AD&D third edition, AD&D fourth edition, and Pathfinder. Some of the characters are over 20 years old, and still active in the game. Most of my players have GMed spin- off games and campaigns, and co- GMing when necessary.
The best part of it is, is that we're still playing- the membership has changed, but the game goes on.
My avatar, for today, is one of my personal favourite characters.