An internal-combustion engine needs four things to run. They need fuel, mixed with air, in a ratio of 14.7 to one. An ignition-spark lights the fuel and air mixture, creating combustion. Compression of the fuel and air mixture makes it explosive. The final necessity is proper timing, of the components.
1 The length of time it takes for eggs to hatch after incubation begins depends on the species and temperatures. 2  For bluebirds, it USUALLY takes about 12-14 days from the date the last egg was laid.3  Different species have different incubation periods, which can vary within a species due to temperature inside the nestbox. Depending on when incubation begins (on the last, or next to last egg), eggs in the same nest can hatch a day or several days apart. 2  It also takes a while for the bird to break through the shell. 3  It could be a new egg from a subsequent nesting if you didn't clean the box out immediately after the last fledging.
The incubation period for chicken eggs is 21 days. You should turn your eggs at least twice a day for the first 18 days, and stop turning after the 18th day. This allows the peep time to orient itself inside the egg before pipping.After day 18, KEEP THE INCUBATOR CLOSED except to add water.This will help bring the humidity up to help the peeps hatch.ou should turn your eggs at least twice a day for the first 18 days, and stop turning after the 18th day. This allows the peep time to orient itself inside the egg before pipping. After day 18, KEEP THE INCUBATOR CLOSED except to add water. This will help bring the humidity up to help the peeps hatch.