We had another bonfire to celebrate another birthday. This is the same pile of branches we tried to burn last year around the same time. Remind yourself here. This year it had been dry for several weeks so we didn't have any trouble getting it started. It was the perfect size. It flared up strong for about 15 minutes, then gradually burned itself out. Within an hour the flame was low enough that we could all go back to the house.
Checking on it the next day, it was completely gone.