It depends really, there's never a set time. I've come here at 3 am and have seen lots of people and also at noon, with nobody. It's hard to tell because a lot of the members are in the restaurant business, with not very set hours. My advice to you is to stop by once or twice a day or check your email, it'll say when someone replies to a thread you have posted on.
It's a wonderful thing to be spoiled in the way of food.