I have just noticed that after I butchered the corpse, (and my pawn collapsed, see my article edit) the corpse still hasn't respawned, and it's been 24+ hours.
Has this been changed in the newest update? I checked Ludeon's blog and didn't see anything in the patch notes about it.
Edit: The corpse has re-appeared, I believe 48 hours later, (which would make the butcher study reset exploit obsolete) though I would like someone else to verify this as I was unable to confirm an exact time for the initial butchering.