How long after the first egg squat should I expect an egg?

As many of you may know I have my first layer, Runt Runt! She's laying about once every 2 days, and has laid a total of 3 so far. She squats just about everytime I go to pet her. But I was gone for 10 days, and on the day I got back that's when I found the first egg. So I have no idea when she started squating. And now my largest pullet did her first egg squat this morning! She stomped her feet in place, flattened out, spreaded her wings out, and looked up at me for several seconds as if to say "Watcha waiting for?". I've heard hens do this right about the time they start to lay. So as the title states, when will Nugget lay? In a few days? A week? A month? And about Runty, she's a RIR or production red, the same for Nugget. Shouldn't she lay just about every day? Or is she still sorting her system out?