Typically, the countdown starts at 27 days after pre-lay shed. I haven't had one lay before that. However, I have had a girl actually shed twice after ovulating and go about 45 days. Start checking on June 28th and call that day 1.
Some of the best indicators is you will find her lying inverted or she will look like she is tying herself into a pretzel as she works the eggs down her body into position. After she does that she will stay pretty tightly coiled over the heat source. Once you see her laying with her tail draped over into the middle of her coils, get ready. Best of luck to you.
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