It should be the same as installing a new copy of Vista. If you can do it without backing up stuff then ~1 hour high end and about as hard as putting the disk in and reading. If you are unsure I am sure there is an online manual you could download and read /print before you attempt it (hint: don't wait till after you start to do this unless you have a second comp).
I have never done it though, so I may be making assumtions that are not true.
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"Wake up, Luigi! The only time plumbers sleep on the job is when we're working by the hour."
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