Did a quick search and in regards to the guinea eggs here is some info
The most obvious thing to know is how long the eggs are going to be in the incubator. Keeping track of the days is essential as you will have to remember when you should stop turning the eggs, raise humidity, and so on. Guinea eggs hatch after 26-28 days in the incubator.
Turning should continue until three days prior to hatching. If you notice any eggs pipping before this point, stop turning immediately as turning could make the keet become disorientated and could prevent it from pecking its way out of the egg. Stop turning guinea eggs on day 23.
No matter if you are hand turning, using a manual turner, or an automatic one, you still need to check the eggs for cracks, seeping, and bad odors. With an automatic turner, check the eggs when you add water to the incubator or at least every 3 or 4 days up until day 23.