They are supposed to lay all the eggs at once. If they didn't then there is a problem as a rule.
They can lay anywhere from about 10 eggs to way up over 100...but its best if they are in the range of 20 - 30 IMHO. If they are producing large clutches then you are overfeeding her all the time. The critical time IMHO to NOT OVERFEED her is starting a couple of days after she lays the eggs for a couple of weeks at least.
(I keep mine cut down to a reasonable amount all the time...not starvation but enough to sustain her in good shape...unless I want them to produce eggs. IMHO...its not just the food that keeps mine from laying...its the whole way I keep them....supplements, feeding, temperature, etc.)