It varies I have female refusing food soon as being paired or even before being paired so no answer there.
As far as a timeline you can really establish one, once you witness the ovulation
Ovulation
10-14 days after ovulation you have a pre-lay shed
27-30 days after pre-lay shed the female will lay her aggs.
Of course those are averages, I had females laying 40, 49 days after having their pre-lay shed.