My current game group plays every other Sunday from noon until 6:00pm with an elaborate dinner break somewhere around 3:00 or 3:30. We play from late October till late May. The summers are set aside for family stuff, and August and September are filled with the Minnesota Renaissance Festival, where we all perform.
I used to play with a group that meets every Tuesday from 7:00pm to around 9:00pm or 9:30. I have not been able to go there in awhile, but I hope to return to that game soon.