How long to give an egg after the other hatches?

[becky_animals]

I put two guinea eggs, fertility unknown, under a bantam hen who wanted to set on eggs. 28 days would've been next Tuesday but one hatched on Friday (so 4 days early?). How long do I let the hen set on the as-yet-unhatched egg before removing it?
Thanks!

 

[FeatherTay]

Can you candle the remaining egg? If the sibling egg has hatched and this one hasn’t, then it probably isn’t viable. But it’s not a yes it’s definitely not viable. If you do candle, can you show pictures? Good Luck!

 

[CluckerFamily]

I take the eggs when mamma decides she is done waiting for any more to hatch.

 

[becky_animals]

Thanks for the input.
Mama abandoned the egg to follow the keet, so I opened the egg. It wasn't a fertile egg, so no loss there.