The suggestion from a baker last night (which I agree with) was to cull after 24 hours, since many anons are only able to get on the board once a day and the "recent notables" let them get caught up on what they missed.
I was about to say that it would not necessarily end up being a fixed number… depends how hungry we anons are for bread over that 24 hours. Lately things seem to have gone down to a more comfy rate.