Guinea's take about 28 day's to hatch. at 100 degree's and 58- 60% humidity. When they incubate the small end of the egg needs to point down, the eggs should be turned about 4 times a day. Cease Turning on day 25 and raise the humidity to about 65% and let them hatch. I recently sold my flock of Guinea's but I like hatching them cause there so easy. One night I checked and had 3 hatched out, the next day I went to look at them and all of them except 1 that never hatched were all out and lively and running around.