Somewhere around 3-5 days. Their bellies are gonna be pink then they'll get all hazy looking and their eyes will turn almost white. Then they look normal then they shed
Last week I thawed out 6 rats for my 6 big balls (hehe) and only 3 ate. I was soooooo bummed! They've all been feeding machines but now that they've shed they're back to normal. I see the ones who didn't eat all out and about looking for food.