Not sure that there's a pattern. I've only been between about 11 am and 5 pm. It's pretty continuously busy. I would guess that just as they open would be lightest. which I think is 9:30 am. Doesn't matter what time. Just ask who is there that day, and ask if you can briefly see whoever's available. One by one, they'll come out and say hello, or say xx isn't available for xx minutes. Frankly they seem to all be cute and bubbly, and I don't think I've ever seen one that I didn't 'appreciate'.