# How Long Motor

This is a curious motor that begs the question– How long will it run? It is a battery powered device that uses light energy to slow down the drain on the power source. The problem with calculating my videos should have some fun with this one. How long will it run the run time is all the variables involves. The math guys who follow —in the real world? Days? Weeks? Surely not years??????. I was inspired to do this by Grandad’s latest video. Here is Grandad’s video on this topic: https://www.youtube.com/watch?v=fm0bm5JW-jE&t=0s