OP is trying to get a percentage relating total cannabinoids in to total cannabinoids out…
If they have to guess the potency of both ends of the equation (biomass & distillate) it’s not going to be a particularly accurate number. I don’t understand why folks are stating their yields based on weight of biomass rather than total input cannabinoids.
Except that they don’t actually have input potency…which is obviously a valid reason 
ie: I guessed the potency of your input. based on my guess of overall process efficiency. using those numbers to then calculate process efficiency is a non-starter. right?
I used 70% as my guess at process efficiency to wrap my head around how much biomass @JohnLong’s 53kg distillate in 24hrs represented. Literally a ton! Assuming whole plant field grown “hemp” at 6-7% total CBD & 90% final potency on the distillate.