55 seconds

Dr. Chris Fastie says:

(Sawing sounds) This tree is about 6 inches in diameter and very dead. The tree broke off probably sometime after it died. And the stump is about 3 feet high and I'm cutting through the stump, about 2 and a half feet above the ground to get a cross section that will allow me to see the rings and tell how old the tree was when it died and by cross dating those annual rings, we'll be able to tell the year that this tree died.