During class, the lecturer should insert three small breaks (after 10, 20, and 30 minutes) to strengthen the attention of the students. The breaks can have the form of a time-out, a think-pair-share, or voting with peer-instruction.
Keep the time. In practice, adults can keep their attention in max. 45 minutes, so students need a regular (15-minute) break after each lesson.
See attention and memory, deep learning, intermediate memory, long-term memory, note taking, think-pair-share, surface learning, time-out, voting with peer-instruction, working memory