Once again, like Rob, I have notes that indicate how much a piece of wire was drawn out to. But some point I made the conscious decision that unless I had so little stock I had to worry or I was working with gold I wasn’t going to worry about how many inches of wire I could draw out of what. The same with rolling metal. So many grams of metal starting at a specific shape will give you only so many MM’s of material.
Very often if I needed more 20 ga. 1" disks I would weigh a disk, melt that much and more scrap and new metal. Roll out what I needed and punch a few disks.
I have often wondered(But never tested it) if 12" of 4mm x 4mm wire rolled to 2mm x 4mm would roll out to something near 24" of stock, minus a little loss. Can it be that simple?