Doing two passes shouldn't take that long. Maybe twice as long as using the sensor, what takes longer is the prep work with wetshaving. You are not just wetting your face and pressing on a can of foam gunk to put on your face. It takes time to learn how to build a proper lather and then apply to your face. I can't see setting five to ten extra minutes in the morning, for the time being, should not be enough to get a careful DE shave in.