No more than three, and that would be one group RP and two 1x1s. I used to do more a long time ago on other sites, but I've learned a lot about myself since then. I try to only join RPs that I'm very interested in and willing to get invested in, not just out of boredom. That, and I like to spend my free time in a lot of different ways, so if nothing is catching my eye, I'll just find something else to do.

The result lately has been just... joining nothing, but that can be how it goes. I'd rather wait and wait for the right thing to come along than join everything and be too busy when the right RP [i]does[/i] come along.