I did that for a long time. You gotta get into a RP that moves at your pace and keeps you interested.
I'm actually surprised I've been running my own RP for 8 months. That's almost a whole year! And only like 3 days have passed in-game. Which is strange, but still! Almost a whole year.
I've been in another RP for 11 months, which is pretty good. Only like 4-5 days have passed in it in-game.
These RP's move at my pace. Which is a very slow pace. I can wait nearly a month before I post, and there's still time after that.