The old rule of thumb for compound shooters switching to curves that you should start at 25% of the max compound weight worked like a charm for me. I was pulling 60# and went to recurves that were 44-46#@26" (my draw).
I'm absolutely confident I can pull, anchor, and hold for 10 seconds or more, recurves at least 15 #'s higher than I would be comfortable shooting correctly. So, that 10 second rule isn't one I'll subscribe too.
I shoot as far through white-tails with my recurve set-up, with arrows 100-125 grains heavier, as I did with my 60# compounds.