The First Rule of Crevasse Rescue is don't fall in a crevasse. Which means good route finding on glaciers, which takes practice. More practice than what you can get in two days. If you're attending this course to be a good rope team partner, but not a leader, than the two-day course may be adequate.
What you really get in a six day course is a lot of time moving on glacier, watching other people lead, and begin to build that experience that will make you a better route-finder.
I agree with Gene, if you can afford the time and cost, you will get a lot more value in the six-day course than the two-day rescue course. More "bang for the buck".
Feel free to message me if you want to talk about this some more.