I got 5 free rats recently. 4 males and one female that was nursing 6 pups.

two days ago the pups started opening their eyes. It now apears that all their eyes are open and they are kind of moseying around the tank.

My question is how long should I keep them with the mother? I have no idea how old they are? How long after they open their eyes should you separate them from the mother?? I guess that is the question I need answered.