Scotty Overkill and blacksmith could do one of those in a day, probably 4-5 hours with a square filed 2 man saw!!
I axed down a 12 inch diameter cherry tree a couple years back and I was worn out afterwards, I can only imagine trying to tackle anything that size. I wonder how long it took
Whoa I am not sure I'd be up for nor want to accept that challenge! But I still probably would and would regretting the decision!