It just depends on the female and when she is ready to lay the eggs. I have ad them go from 5 days to 5 weeks. This year They built the second nest about 20 days after the first birds fledged but she didn’t lay the first egg of the second clutch until day 22. She only laid 4 eggs and is incubating them now.
Last year they built a second nest after about 3 weeks but never laid another egg. They did have nestbox competition and may have gone elsewhere for the second family.
BTW you are doing pretty good without a tripod. I may have to look at another lens. That 250 looks pretty good It looks a bit sharper than my 200.
David
David
Stafford, VA