it takes 72 hours for the stitching to seal and usually a week to heal completely. So I would say a week to two weeks depending on how they play together. You can just keep her separated at night as well, or when you can't supervise.
Wait at least 10 days. Sutures should be almost dissolved by then.
That's what I was worried about, I am going to call the vet tomorrow as he knows them both and see what he says. They didn't think about that part I'm sure when we left
Aww that just sounds so adorable...but be cautious even fun play wth that much difference in size/weight can cause kitten some serious injuries.....I would not allow any contact until she is WELL heAled 10daays to two weeks...