[quote=@Inkarnate]
One of my most successful RPs lasted around three-to-four years, and we’re (that group, or what remains of it) still writing continuations of that story. We started that RP thirteen years ago. So I guess by proxy it is my longest running RP.
[/quote]

Wow. That is a exceptional run of events. 
Hopefully I can find one that does go to conclusion and not end early :)

Mines made 2 months so far. So by first RP standards. I think I beat the odds a little.