[Gecko] leopard gecko eggs

[BTBDHerp]

Hi everyone,
     My leopard gecko, who was pregnant, layed 1 egg on Monday.  I was there when she layed it,and i put it in the incubator right away.  I waited for her to lay her second egg, but she didn't.  I felt her stomach, and I didn't feel an egg.  Then today (friday) I see that she layed the other egg.  I don't know when she layed it, but it had to be between 1:00 pm and 5:00 pm.  Unfortunately it had collapsed, fluid had leaked out, and the top was hard.  Since I thought she was finished laying her eggs, I took out the moist vermiculite I had in the tank.  So she layed it right on the sand, and I sprayed the sides of the tank around 8:30 am.  So it wasn't very humid. 
     My first question is is it normal for leopard geckos to lay their eggs 4 days apart.?  If so, could the egg have collapsed in 4 hours from being too dry?  Or was something wrong with that egg or her delivery?  Any answers would be much appreciated.  Thanks.
Jill