I don't think they make reservations unless everybody is there. They are very very busy so you could find out how long it's going to take and decide
I would make reservations for a large group but two people usually get in within 10 minutes.
It never hurts to get on the list, but you don't have to make a reservation days in advance
Usually helps for bigger parties but for the small parties the wait is not super long. Maybe any groups over 4
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