Someone just asked me on another forum how long it took to climb... here's my answer.
We arrived at about 7:30pm via bus at the bottom of the mountain and had to hang out there for an hour to acclimate to the already thinning air. We started up about 8:20 or so and got to the top around 6:30-7am. Not in time for the sunrise, but in time to FINALLY get warmed up a little bit via the sun. It's FFFFing COLD up there, let me tell you. Some said the toughest part was going down... FFFF THAT, the toughest part -IS- going up. Going down you get a nice view of everything and it looks beautiful... going up is in the dark, you need to spelunk up rocks and other shit.. it's not just a combed path in the least. There's some portions that people have made into 'steps' (like stairs) but those are few and far between.
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As for how I felt... well, I couldn't walk up or down stairs for about 3 days after that. Next time, I'm going to spend the first entire hour at the bottom of Fuji by streching EVERYTHING I can.