How can I get my total hours used on my account?
DuoLingo does not have a feature to show much time a person spends on it, althogh several teachers have asked for this. However, lessons DO have an estimated time feature in the course outline. Basically, a lesson is expected to take 10 minutes, unless you read the discussions or go outside DuoLingo for help. So I estimate my student's study time by counting the number of lessons he does and multiplying by 10.