I usually watch episodes on YouTube the day after the live broadcast because it fits better with my schedule. But I just discovered something today that is very useful and others may not know about it either - when you click on the "gear" icon at the bottom of the YouTube video (i.e. to change the resolution), there may also a "Speed" select box to either speed up or slow down the video. Available speeds are 0.25x, 0.5x, Normal, 1.25x, and 1.5x.
I just watched Day 017 at 1.25x and while it seemed a bit fast at first, by the end of the video I had forgotten that I was watching it in "fast" mode. On a 100 minute video, this just saved me 25 minutes (if my math is correct).
After looking into this a bit, I think this feature may only be available in the HTML5 player, which you can enable on your account by going to http://www.youtube.com/html5
Hope this helps!