If you are watching video to learn things like T-SQL or Business intelligence, you can spend a lot of time watching these videos. There is a way to speed up your learning. Just speed up the video.
In Windows Media Player 12 right click in the video and select Enhancements and then select Play Speed Settings.
Then change the play speed to a higher speed like 1.5. If the person speaking in the video speaks real slowly, then you can bump the speed up even more.
You can watch a 3 hour video in 2 hours at 1.5 speed