Is that a homemade bator Cool! you never know but if the temp fluctuates, sometimes it delays the hatch. Be patient and resist the urge to open up the bator and "check" on it! If you have not candled it, you might try that and see if you see a beak in the air pocket in the big end of the egg. If so you are very very close. Just don't mess with it too much. Hold it up to your ear and see if you can hear him pecking at the shell, if so you have about 24 hours max.