Don't forget to calculate the kwh for the machine running!
Discussion
I'm certainly going to guess on that!
Why guess? You have at least the manufacturer specs for the load (how many watts) and you should know how long it took to dry that stuff. Multiply the hours by the wattage and there's your total. It's better than guessing.
Why do you always make me do work? I just want all the answers given to me.