It really depends on what I have going on in my life and/or the posting "style". If its a freeform or low cas type of deal where it's a few sentences per post I can handle quite a few. But big, multi-para advanced level RPs? Rn my limit is like 3 max. I've got 2 running rn that are very sporadic in how often either me or a partner posts and honestly don't feel like I can handle more than that atm XD