it goes by body and fat content from knowing a bit of chem i would say 2 50 lb bags would melt a 200+ pound person in a week or less remember you need a little water to start action and it wont do in steel after market accessories. and not in aluminum.
Lye(NaOH) is great for soap making and KOH for bio diesel Slacked lime is a must for open latrine treatment.
I remember hearing about a body liquefaction funeral type service
the article says 3 days nothing left at 10 atmosphere at 180 degrees using KOH a double in open single pressure only problem now you have a lye soup you need to store or dispose of though easy enough to return to a ph near 7 and dump safely