How long are fertile eggs good for before they must go in the incubator? whats the proper amount of time to let shipped eggs settle before putting in the incubator? is the temp in the incubator supposed to be diff if you use still air compared to circulating air? my still air has been plugged in and set up for 4 days now and ats at a solid 99.5-100 constant with the thermometer setting right where the eggs will sit. Is this what I want? I have a digital temp/humidity meter that I hope arrives today too. what should i go for in humidity?