I budget one hour for every closing. Some take longer, some are shorter. It really depends on the parties and whether they chat amongst themselves or have a dispute.
A closing in which all parties just want to get the heck out of the room and there are no disputes is normally over in about 30 minutes.
I never want to rush anyone. Our closers are trained to give the consumer the time they need to understand the transaction and be comfortable closing. We budget the hour and adjust as needed.