As far as I know Robin, and not being very successful when I tried to breed the little squeakers, it's pretty much the same as with rats. I did a bit of googling and it does seem around the same timelines. The babies should start nibbling mums food and trying her water bottle at about 2.5 to 3 weeks. They'll still swarm her for nursing though. You can wean them anytime after 3.5 to 4 weeks of age depending on if they are of a good size or gradually wean them like Bdadawg does with his rats (4th to 5th week remove mom for gradually longer periods from her litter).

If you want to give momma mouse a break you could put a small kleenex box or something in there that she can jump into or on to but the babies aren't big enough yet to follow and bug her to nurse them.