depends on the stage of sitting (sometimes they off & on for a few days while still laying new eggs) in which case the early laid eggs likely won't hatch.
Which is why some ppl discard those when the hen goes into "hard broody" replacing w/ a known good batch of whatever eggs you really want to hatch.
Also depends on weather, in very hot weather I've seen them get up more often, in fact I've had broodies get off for long periods in extream heat,
when it was so hot it was ruining the eggs, ie well over 102 for several hrs
But normally a "hard broody" will only get up 1-2 x/day for only a few mins each, then the last day or two until she gives up on unhatched eggs sometimes even 3-4 days solid she will not get off the eggs/chicks at all. That of course is a really GOOD broody.
Hope this helps.
Which is why some ppl discard those when the hen goes into "hard broody" replacing w/ a known good batch of whatever eggs you really want to hatch.
Also depends on weather, in very hot weather I've seen them get up more often, in fact I've had broodies get off for long periods in extream heat,
when it was so hot it was ruining the eggs, ie well over 102 for several hrs

But normally a "hard broody" will only get up 1-2 x/day for only a few mins each, then the last day or two until she gives up on unhatched eggs sometimes even 3-4 days solid she will not get off the eggs/chicks at all. That of course is a really GOOD broody.
Hope this helps.