Pot Still Question

[Shifty]

Hi there,

Having only done one run with a reflux still, I am considering removing the middle column and running as a pot still for a "rum" wash. What would the anticipated volume of output be if I am starting with 5 gallons of 18% mash? I know that folks had said 3/4 - 1 gallon using a the reflux method, but obviously the pot method would yield a greater quantity, since I would be capturing a less pure output. I was hoping to learn what that quantity might be?

Thanks!
Shifty.