Yeah, RPs could get very big. Every part of Aria (not counting the sidequest) was well over 1500 replies, and it was a six part RP. Days of Future Cats (another RP) was at something like 800, and Chasing Yarn was almost at 2000. Even if you didn't want to count RPs for whatever reason, I had an old thread back in Gaming that was about 400. And, that wasn't even listing out numbers, it was accrued through various conversations. And those are just my posts. There are plenty of threads by other people that I'm sure far surpass whatever I've got.