Traffic school can be an easy way to reduce points on your driver's license and avoid potential auto insurance spikes. But the length of traffic school tends to vary between states. For example, you'll find courses in Nevada are a minimum of five hours for two or fewer violations within a set timeframe. Three or more violations result in an eight-hour course. Or, in Idaho, the minimum is a six-hour course. Both can reduce up to three points from your driving record and come with certain eligibility requirements.