I've observed that lectures, whether for history or physics, last between for at least 45 minutes, often going beyond the 60-minute mark. I highly value the help gained when learning from a good instructor but sometimes, I fail to understand why college lectures are so long. Even for subjects I have an interest in, I find myself wanting to just close the video and maybe watch it on another day, because I think there might be more to be gained from watching it fully. The reality is that I rarely ever go back to the lecture! Of course, that is a personal issue that I should take care of. However, if I were to be in a real lecture, it would not be possible for me to leave the room on a whim at a given moment, for it would be disrespectful and a disturbance not only to the instructor but also to other students. To sum up, the ideal length of a lecture for me would be in the range of 20 to 45 minutes, depending on the topic being covered. Frankly, I don't think I would be able to concentrate any longer. Besides, I feel that the bulk of the work should be done independently but that's just me. As I said above, I value the insights the lecturer but I do not think long lectures are necessary. What are your respective opinions on this subject? Further, how do the "tutorial sessions" with a TA work?