Well I'm in the dark on it so any ideas are helpful!
We don't have a kitchen table -- well my sink is sunk in the kitchen table- we don't use it to eat at.
My dining table is a pool table with a plywood on top! Tablecloth hides the reality and it works for a table! Don't have anywhere else to keep the pool table so it does double duty.
So my table is longer than most! It's no help for figuring out a good size to sell.