Mine are all going through their first winter and while most went through a short winter break I think many of them have come back into lay, but some are still sporadic. It seems when most are going to lay they seem to do it all at the same time around 10am-2pm. Rarely do mine lay after about 4pm. I've seen up to 5 of my girls trying to lay at the same time, which is interesting seeing as they insist on only using 2 spots and would rather wait their turn than use another nest box. So there will be days when I hear a lot of squawking as they tell the one laying to hurry up. 
I expect to see quite a few by 11am tomorrow seeing as I only got 5 instead of the usual 8-12 I've been getting.