Actually, I'm guessing towards six bodies being his limit. we already saw him having only six tubes of paynes, and if he was actually a puppeteer, then he's arsenal would probably be wider and he'd make sure to collect special ninjas a specimen, like how Sasori acted.

so far, the only important body we've seen was Yahiko's body, and nobody recognized the rest of the bodies (other than Inochi saying "that girl! she's a no name dead girl!"), so my guess is that Payne can divide his abilities between up to six bodies, and he needs some sort of cool-down time or a special surgery to get new payne-bodies running.

still, I think a Jiraya body would better fit Payne than Kakashi.