your kidding right? He means a complete re-install. Means format, os, and ALL drivers, probably personalized settings and tweaks alsom and back ups. This takes at least 3 hours. For me it takes 4-5 hours at least as i like my os tweaked to my liking, this involves even registry editing. The os alone is an hour and a half, plus 20-30 mins for a full format depending on the size of the drive/partition, then add tweaks. That's just to install the os my friend.
EDIT: haha, Inferno beat me to it, dang dial up taking 5 mins to post it.
Takes me ~30 mins to get vista to a useable desktop, then a further ~30 mins to get drives and main apps on, and then I just install the odd app here and there when I need them.