A: A number of people have asked about this.
The way the Green Tuner works is, you lift a lever on the dial and turn it for about 20 seconds. This charges a capacitor. The charge lasts a long time. We’ve had it powered on for over three hours and it was still working.
So no, you do not need to crank it while you are tuning and you do not need to crank it every time you want to tune.