The most common max power on a new radio is 100 watts, although some of the more expensive radios could have more. With the stock 100 watt radio, depending on atmospheric conditions, your antenna type, and the height of your antenna, you could talk to most all countries, but not on demand. What I mean by demand is that you can't control when you will make each contact, but each day, or night, you may contact some part of the world.
1 In addition to specific course and scholastic average requirements, each candidate for a bachelor's degree from the University of Illinois at Urbana-Champaign must earn at least 60 semester hours of UIUC credit, of which as least 21 hours must be 300- or 400-level courses at this campus (Student Code Art 3-801).
At most colleges and universities (with conventional semester systems) 12 credit hours is considered the minimal number of hours for full-time status. This means that you will spend 12 hours in the classroom each week. (Typically M - F - most classes being 3 credit hours and meeting twice a week for 1 1/2 hours. So you would sign up for four 3-hour courses.) Many full-time students take 15 credit hours (five 3-hour courses).