I'm not going to bother with dates, its hard enough to keep everything in order.
Mutually Assured Defense - I doubt I was there for more than three month before they merged into Echelon.
The Gramlins - Probably somewhere between six months and a year.
Federation of Buccaneers - A couple years, easily the most fun I've had in CN.
Poison Clan - Less than a year, might be the "best" alliance I've ever been in during the period I was there.
The Privateers - Just long enough get bored and delete.
GOONS - 666 days now, how about that.