Originally Posted by Bob Cofer
Funny thing is I have done this for years. Here in the PNW it's about 10 minutes per finger.
I'm with Bob. Do this regularly and have for many years but I figure it is closer to 15 minutes per finger. It is an individual thing and depends on your arm length and size of hand. I usually make my hand into a fist rather than flat hand and use the fist to measure an hour. At the 49th parallel it works year round. I don't know how well it works in the arctic or nearer the equator.