If more than one Guinea Hen is laying in the same pile of eggs it may get huge, up to 60 eggs or more before they go broody on it. And your other Guinea Hens may still continue to lay eggs there even with a Hen or Hens on the nest full time. The broodies will usually pull the freshly laid eggs under them to sit on too... so you may have lots of keets, but a mess of a staggered hatch. It's sometimes better to isolate one Hen on the pile of eggs (some how build a pen around her to keep the other Hens out, without disturbing her too much) and take away all the extra eggs so she only has enough under her that she can effectively cover and hatch. You'll also want to keep track of when the Hen goes broody so you know when to start watching for keets (between 26 and 28 days)... sometimes other Hens or other birds in the flock will decide to kill all the newly hatched keets if they can get to them. But hopefully all goes well for you.