Paul 852.
The problem with this calculation is that you are limited to 900 (or so) flight hours per year. So at 8 flying hours per day you can't work more than 113 days per year.
Don't forget though that the earlies, making up half the days, are 9 hour DUTY max. Normally only two sectors. I do agree with you though. It was a bit of sloppy figuring on my part. However, I think it makes the point that pilots "work" more that 17.5 hours per week.