In my history of RPs and hindsight, I often vanish from RPs that often end up taking more time commitment than I initially thought. This is often reliant on the other players, perhaps they're posting too much or too fast and I just can't keep up. I hate to call people out of that and it eventually gets to a point where I slide myself into the background and never post again. I've been upping my effort to not leave quietly anymore though.

Especially on this site it seems casual can be anything from 1 paragraph per post once a day to multiple pages worth 2-3 times a day. Then you've also got issues with speedposters and coming back to 60 new posts every day sometimes. There is a significant time commitment differences and it usually can't be even estimated until 2-3 posts into the roleplay.

I've been considering GMing an experimental roleplay with more strict upper and lower limits on post size and frequency to see if it retains players better.