My son's came off around the fourth day. But we gave him baths and made sure it was dry after.
My baby's came off at 2weeks
As long as it has a clamp on it you can bathe him and just make shore you clean it with an alcohol wipe after you have him all dried off. Thats what the doctors tell us to do in Australia and never had any problems with my sons
Give it atleast 2 to 3 weeks .
I believe it varies I know with my daughter hers didn't come off all at once it would be pieces at a time lol