A lot of people do four courses over 14 weeks, and that average of 24.5 days/course makes a speed reader's ~11 days/course without all the work and stress of assignments he understands before completing unimpressive. Sounds fun though.
The pace I'm planning on sustaining is to do a class in 5 days (1 day for my work and 1 day off each week). What's impressive is all relative, I suppose, as I know plenty of people who could put my work to shame. I only hope to share in the process so people can learn from it.
Scott H. Young is giving himself 12 months to complete MIT's computer science curriculum on his own, via MIT's OpenCourseWare.