The best answer - and unfortunately a kinda smart alec one - is when you stop watching for it to happen! Not what you wanted to hear, I know. Not what I wanted to hear either when I was told the same thing. Those onery little girls will wait until you decide, "Well, I'm tired of checking every 15 minutes so since there was nothing this morning I'll wait until tomorrow." Yup, and when tomorrow comes you'll go out to the coop and find a few eggs with no way to know who laid what!!What does everyone think? When will they start laying?