Generally here's how egglaying goes....
The female may dig several test holes but should settle on one and dig it until she is satisfied with it. It can take several days or be quite quick. Once she is happy with the hole, she will turn around butt down and lay the eggs. Usually it happens in the evening. She should then fill in the hole and tamp it down and return to the branches. I always recommend that you dig up the infertile eggs to see bow many were laid.