on 6F I can wean and sell at 3-3`1/2 weeks...on zeigler its takes over 4 weeks.
if their eyes are open, toss in a few nuggets of food near the babies. If they take interest and start eating they are ready to be weaned....
weaning time depends on what size you want....
if you want them big, separate moms individually into nursing tubs and let them wean the babies themselves (normally 5-6 weeks)
mother's milk will make them grow about as fast as you can get them to grow.