Epic
Had a halfling psion right when the Psionics Handbook came out.
Ended up a Nomad 10/Soulknife 10/Slayer 4, updated twice along the way, once to conform to the alternate rules by Bruce Cordell, then again to conform to Mindscapes, also by Bruce. I haven't updated him to 3.5, and I don't think I will. He just wouldn't be the same, and we let those guys retire to somewhere nice.
We played for about a year, 10-13 hours every other weekend. Then the DM was ready to drop to player status, and we started a new campaign.
I am currently a DM for a group, and they are close to 12th level. We play almost every weekend for 6-8 hours. I think we started in February. I tend to levy out a good deal of experience, including for role-playing. It makes the players level up faster (which they like), but I like giving the xp because it encourages the players to get involved more.