I teach four hour blocks at a health care trade school. This is really a challenge, especially when you consider that an adult's attention span is under eighteen minutes. As a result, I really try to focus on designing lesson plans that consider learning styles and that build in a lot of active learning strategies.
For adult learners, connecting the learning to their future career path and building in active learning that incorporates learning styles is critical. Often, I view myself as a facilitator more than as an instructor. I facilitate mastery learning using research on learning styles and active learning.