Robin, with only one clutch hatched so far (100% hatch rate though) you know my hands on experience is limited. Be that as it may, this is what we did.

We aired the hatching box every three or four days for just a minute. At that time we quickly looked over the eggs. Every week or so we candled the eggs just to watch and learn what occurs throughout the incubation process. At day 45 we started airing the box daily and removed the press n seal from under the hatching box lid at that time. At day 52 we cut the eggs.

We did that with Ardra's clutch and that's what we're currently doing with Dori's clutch (which you'll be happy to know is being cut this coming Monday!)