I just ran my last hatch dry till day 18 when I brought the humidity up to 70% ? Hatch was great , even better then the seller of the eggs ? As far as eggs hatching after you think you're done ..........I've heard chicks chirping in plastic bags in a dump where the hatchery had a fifteen foot hole to dispose there unhatched eggs ....sadly there was no way of releaseing them .When we were younger ...70's....we used to find RIR chicks at the dump ! Hatchery dumped there un hatched eggs there and they hatched in the bag or in some cases the bag tore and there were little chicks everywhere ..........I think we caught up to twenty one at one time ! Very tough ,or as one said .......we under rate how tough these eggs and chicks are and as well as the conditions that they can survive .