I would like to try to do this sometime, caculate my time in a quilt.
My friend that does sewing alterations and repairs gave a good suggestion.
She has an electric clock, the old fashioned type, not digital. She has it pugged in to a plug bar, sets it at noon. Every time she starts on the project, hit the power. When she leaves the room, turns it off. Easy way to add up the time without grabbing a pencil and writing down the time.