i don't think you can disturb them for a few weeks yet, i can't remember how long though, there's a thread somewhere, i'll have a look...
i can't find it at all, it wasn't that long ago either. i know it's stressful for the mother when they are young and helpless. i wouldv'e thought it would be nearer the time they were weaned but i can't be certain, i have no experienced with these sorts of things, sorry x
I'd leave it as long as possible - but if it's urgent, can you transport the nest too? So you can set them back up in new place with nest still in tact for minimum upset
Most people said 3 weeks when you asked on this post
http://forums.rabbitrehome.org.uk/showthread.php?t=132480