There is no one answer for this... genetics, humidity, temps, and individual dragons all play a role in how long it will take. Every clutch we have seems to be different.. and the conditions are exactly the same everytime.
We keep it at a constant 83.1 degrees with high humidity. Our average clutches take around 65 days or so. It can be anywhere from 58 to 72 or more really just depends.
If the eggs are starting to sweat it should be anytime now. You will know when they begin hatching bc the eggs will dent and collapse from them slitting the eggs open. Once they do that, it will take many hours for most to get their heads out, and then their bodies. It could take 24 hours easily. It's important to leave them alone and in the incubator so the egg does not dry out and make it harder for them to come out.
The eggs should not be in an air tight container inside the incubator. Make sure there are a few holes in the contaier for air and leave the top on... will help keep the humidity up. Just check them every few hours or so and you should see some heads popping out soon.
congrats when the time comes!
brandon
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Dragons by Nature