Fractional Distillation Of Cannabinoids

I am never one to buy things that come in combo's/kits but i noticed.

Most kits come in sizes of 2000ml and 5000ml.

I can't find any information on how much crude/material is actually needed and how much is actually processed. If i wanted to make say 250ml or even the 2000ml listed above. How much crude or material would be needed in a broad range.

I have done the search but come up empty on how much can be processed for how much medicine returned. Before i sit down and actually learn the mechanics behind this process.