At my college we have over several years had progressive changes in the length of our classes. We started with 4 hour classes, then a compression of the number of classes total brought our classes to 4.5. Now recently our terms have been shortened by a week with additional time added to bring our classes to almost 5 hour in length. Our night classes actually run as late as 11PM. We do have almost an hour that can be used as break time throughout the class. However these exceptionally long classes, even with a large chunk of them being dedicated to practical hands on lab time, stretches the limit of both student and instructor endurance and concentration. I sometimes feel at a loss as to how to keep my students focused and engaged as 10:30PM rolls around, especially when I am feeling a bit burned out on the subject myself! There is no changing the situation, it is here to stay. So I am looking for ways to keep the students engaged and focused for as long as possible. I have done some things like splitting a class into 2 different lessons to at least make the subject matter more interesting with some small success. However, I would welcome any thoughts or suggestions!