This article is from the Europe FAQ, by Yves Bellefeuille firstname.lastname@example.org with help from Martin Rich M.G.Rich@city.ac.uk.
A common mistake is to try to see too much on a short trip. "Major"
cities such as Paris, Rome and London are easily worth an entire week,
even on a first trip. Even "minor" cities are worth an overnight stay.
You'll typically see more if you choose to explore one or two cities
thoroughly rather than if you try to see the whole of Europe
As a rough rule of thumb, don't try to visit more than one country for
every week of your trip.