Thanks for everyone’s help. The Briskets finished coming off about 1.5 hours before serving time. They estimated up to 500, but ended up with around 300. By the end they had 4 Briskets left over. They turned out well enough that they had an auction at the end on the remaining Briskets. I certainly hope to have one large cooker next time instead of 4 smaller ones, but at least staying up all night gave everyone decent food for the charity event.