At the mountain I work at (which will remain unamed), there is absolutely zero guarantee that you get 30-40 hours per week. Full time instructors get a minimum of 4 hours, part time gets 2 for days that you are scheduled. Generally you get 5-6 hours of work the days you are on schedule, that being said, this season has been much less given the weather. I know most instructors this season are making far less than they did last season.