How long will a hen stay broody?

[BradD20]

I have a RIR hen that has been broody for a 1.5 weeks now. I have some marans hatching eggs in the mail, will she stay broody long enough to hatch them? She has been sitting 24/7 for 10-12 days. I have been pulling infertile eggs from under her and leaving her a couple each day to sit on.

 

[Squawkers]

there is a chance that she’ll abandon them when she feels like she has been sitting for long enough, but I had a broody that had been sitting for about 1.5-2 weeks when she got eggs and she stayed the whole time. I don’t really think it is the best for their health though.

 

[nuthatched]

There's more way to tell. Is this her first time being broody? Have a back up plan in case she quits.