This past semester I to had 4 hour lectures, I broke them up into 40 mins I had only 7 weeks to to teach 30 chapters.(week 8 was their final) I used I clickers, lecture and games to keep them interested. When I started to see students get up more frequently I would call for a ten minute brake, I also brought in snack foods the last day as it was presentation day (a day when the students had to do a presentation)for the most part the students seem to like how I broke the class up. I also let them know when it would be a breaktime on the PPP handouts, they stated that it gave them a goal to know that I was not going to talk all four hours.