Learn Spanish Level III contains 15 lessons. Each lesson contains between 500 and 1000 sentences. Each Spanish lesson takes between 45 minutes to an hour to go through. Level I will take between 11 and 15 hours to complete. Lesson III is a continuation of Level I and II. It is not necessary to have done Spanish Level I or II if you have a good foundation of Spanish vocabulary and grammar. However, Level I and II are recommended because they set up the foundation for future vocabulary and pronunciation drills that are used throughout future levels.