How Much Do Hands Move?

Almost a month ago I received an email asking "What percentage of the day do humans use their hands?" The question stumped me at the time, and has had me pondering it ever since.

I suppose the best answer is that humans use their hands all the time - 100% of the day. Even when the hands are not in motion, they can still be seen holding a position that reflects what is happening in the person's mind. When the thoughts and emotions (and the nervous system) change, so does the natural hand position. Every finger twitch tells a tale, and even in sleep the hands can move.