Just my personal preference, but I take my broody off every afternoon so I can check the eggs. A couple of times I found new eggs in there that weren't supposed to be there. She takes a 10 minute break to use the bathroom and get something to eat. If the weather is warm she'll be gone for 20 - 30 minutes. I'd rather know she's out doing her business when I'm home than have her do it when I'm not home and then somehow end up in the wrong nest box. I've also heard of broodies holding it too long and then they go all over the eggs.