Got chatting with my group last night, and wanted to bounce this off the peanut gallery:
Assuming the "end" is a planned, intentional closing event where most/all key stories are pretty much wrapped up:
How long, in Sessions or Adventures, do you think a Campaign should last?
How long (in sessions/Adventures) does it usually take you to get tired of a campaign or the characters therein?
How long (in sessions/Adventures) before you typically see a group petering out?