Each Unit in Look focuses on one topic.  ​For example, Level 1 Unit 6 is called 'Homes' and focuses on this topic.

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A Unit is made up of Lessons.  In Levels 1-6, each Unit has a Unit Opener and 7 Lessons, while Starter level has a Unit Opener and 5 Lessons.

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Nominally, one Unit is around 3 weeks of teaching time, at up to 3 hours per week.  However, each user will decide their own pacing.