Really it depends on our cast, I mean...if the story sucks then you won't have a story that will end EVER cuz everyone will drop it.
BUT, if everyone's having fun then you start too see extensions being thrown in out of nowhere and interesting plot twists. OF COURSE these are the types of things you love to see in RP ^^ but sometimes never finish
Now there's the rp that everyone's just 'lub-dub' on and don't care either way. These aren't usually too long but can go for a decent amount of time.
*Reminisces about older rps*