WOW that is a lot of eggs! Good for them, over achievers LOL! Yes you should only wait 48 hours because at that point the hen will usually be compelled to leave the nest because the first hatched chicks will be ready to move around. But it you have them locked in with food and water you could wait alittle longer I guess. The other suggestion would be to take one hen and all the chicks hatched from both hens and move them and put any remaining eggs under the other broody. Might work.Keep us posted and I will help with advice as I can, I am not an expert but have had trials and turbulations with broodies. I have 2 Cochins setting on eggs(one hen keeps stealing eggs from unfer my muscovy hen) but the other day I randomly checked and pulled out 3 chicks, since she still had eggs left I put the chicks in with the brooder, she is in an unprotected busy busy coop with teenagers, and ducklings and fullsized muscovies so I didn't want to chance it. I just had a bad experience with my Muscovy hen hatched 10 ducklings, I kept them locked up with her for 2 weeks and then let her out with in 48 hours she was down to 6 chicks, one was squished under a piece of fencing and 3 simply disapeared and she is a tough mommy! So no matter what you do something could always happen. Lets hope yours is perfectly fine. and yes it is too late to move them. It is best to move a broodie early in the setting process, once it is close to hatch time the eggs shouldn't be moved as the chicks are getting into hatching position..... Happy Hatching!!!