Broody Hen

[Peran9]

I got a broody hen. my question is for how long a broody hen is allowed to go out of nest box. and how long if she goes out of her nest box the eggs will rott? if she leaves the nest for 2 hours eggs wont hatch right?

 

[Peran9]

Whats the time limit for a broody hen to get in order to get back to her nest sit on eggs?