have you read the bucket tek thread?
@Photon_noir probably has analytics on this. I plan on generating them once I get my 755 spun up. pretty sure @Pharmer_Joe has data too.
this is not a lossless process. you loose solvent to each batch of biomass (less with a 'fuge). that solvent has more cannabinoids per ml on each pass. at some point (depends on input potency), the amount left behind by the increasingly saturated solvent means it’s time to switch to fresh solvent rather than throw away more cannabinoids.
total yields will absolutely be less than if you do not reuse your solvent on subsequent batches of biomass, but it you can cut your solvent (and hence solvent recovery) needs by 75% or more, it is almost certainly a win.
YMMV based on input potency and how you get your solvent off the biomass.