Is it ok to candle eggs twice a day?

[Sussex19]

In the moment I've got a broody hen with a staggered hatch. (I am fully aware of the problems with this, and it was not intentional) I have got the incubator running, and my plan is to move them into the incubator just before they hatch, and then hold them in a brooder until they have all hatched, at which point I will put them back with the hen.
However, to do this I will need to to candle at least once a day, preferably twice. Is this ok?

 

[nuthatched]

Why twice? But yes, that should be fine.

 

[Sussex19]

Why twice?

The problem is I don't know which eggs are on which day, so all I can do is look for internal piping. Maybe it not necessary, but I thought if I only candle in the morning I might miss one until the next day when it may have already hatched.
And I don't want the hen to see any chicks until they have all hatched in case it stops her from sitting.

But yes, that should be fine.

Thank you!