Home Distiller

Ive been hearing a lot about the infamous and required vinegar run. I have to admit I substituted this for a few sugar wash cleaning runs on my smaller still but with the new build, I want to do it correct. I'm running a 15.5 gallon keg and figure most of my washes will be 10 gallons so I figured the vinegar wash to be the same size. The question is how much vinegar? Ive searched and not found so I'm asking.
Thanks. You guys are the best.