Over the last week I've been working on a detailed comparison of two drum carders, and as part of that I have been carding a lot of fiber. My crowning achievement, though, was in the Rumplestilskin category, where I managed to card 16 oz of alpaca into 19 batts averaging 1 oz of fiber each. How I did that, I will never know.
(Actually, I have a fair idea that the original weight was on the low side.)