Should I lock down tommarow or sunday ?

I'm not familiar with button quail, only chickens. I don't know which "day" you are supposed to lock down with button quail. But the same general rule applies. An egg does not get a full day's development the instant you put it in the incubator. It takes a full 24 hour day for an egg to get a day's worth of development. With chickens, you lock down after 18 days of full development. With chicken eggs, if you set the eggs at 7:00 p.m. on August 9, they have one full day's develop at 7:00 p.m. on August 10. They have 18 days of full development at 7:00 p.m. on August 27 so that would be lockdown. If you know what "day" you are supposed to lock down button quail eggs, you can count it out using this method.

People get really confused on this but if you use a calendar it can be pretty easy. Good luck!