What are the differences between 20 minute lessons and 40 minute lessons?

Beyond the obvious difference in duration, 20 minute lessons are structured to be more streamlined for both the student and the tutor.

In 40 minute lessons, for example, students can elect to have an either "Correction" or "Discussion" focused session. In 20 minute lessons, however, they are only able to have a "Discussion" focused session, which means 20 minute lessons are inevitably focused more on debate and conversation, with feedback being offered in the final 5 minutes or so.

Similarly, to reflect , the maximum number of questions (green ticks) that a student can choose is only 3 for 20-minute lessons.