Generally, around 10:00 AM. A little earlier is probably fine, but we don't want to wake Henrietta up or make her neighbors call the cops by showing up at the crack of dawn. It usually goes on for at least a couple of hours, at which point we break for lunch. If you are going to come late, make sure to let those folks with whom you're trading know about it; otherwise, people might consider you a no-show and send your plants home with someone else.