There is no actual time. It takes as long as you'd like it to take, whether you'd take the time to see every single artifact and visit every single place it'd most probably at a minimum take 3 years? PARIS IS THAT BIG:D
I think it would take a very long time. I think about 82 days.
You would g to Paris France
In paris
Le Catacombes De Paris, of course.
everywhere
If you have any sense, 3 days; there's so much to see on the way. If you really must do it in one go, it will take about 6 hours 30 minutes.
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It is a historical site, a landmark for France and Paris, and from the top you can see Paris.
I would go to your local garage and ask. See how much it would cost and how long it would take, and see what needs to be done.
Paris
Paris
If i was going to stay up for a long time and i would show it too my friends and i would take care of it