Get a good solid snow shovel, first of all. That can make all the difference. How long will depend on the amount of snow, the type of snow and the area you are shoveling (how big, etc.). If I were you, I would price each job based on size, rather than hourly. Like if its, just someone's driveway and nothing else, I think $10 is fair whether it takes you 30 min or an hour. If its a larger area and includes sidewalks, adjust accordingly. And definitely bring salt! Once you get off the first heavy layer, then sprinkle the salt and let it sit while you move on. The salt will do half your job for you. Good luck!