Help and questions What is a course “session” at CLL? A session at CLL is a cycle of courses of between 20 and 40 hours, divided into 10 to 20 lessons of two to three hours each. Was this article useful? Other related questions How do I choose a course adapted to my needs? Should I enrol in a course that corresponds to my current level or to the level that I want to achieve? Will the courses take place even if there aren’t enough enrolments?