Uh, yeah, no. I spent probably 5 or 10 hours wrestling with Kindle in the last few days and I'm still not so sure about the formatting. It still has some small glitches I can't get rid of, short of converting the whole thing to HTML (and since I moved it all into Pages because that can convert to ePub, I don't want to knock it into another program....).
But anyway, if you count doing formatting/Kindle work, and Googling for solutions to that and interesting and necessary things like tax questions online, I definitely hit my 100 hours in 40 days! Will probably take a bit of a break tomorrow and will be reading one more time on my Kindle this weekend.