Not sure if this is a joke or a serious question, or a bit of both, but our current dealer is about 5’6” 140lbs, but I’d like to make the table so it will be good for most people to comfortably deal on. I have had one of my buddies deal for a night, when my wife couldn’t make it, and he is 6’3” 250lbs.
I would go with at least 30". Lots of space for the dealer who needs it the most. With a table of that size, all of the players will still have lots of space.