I sometimes get requests for Europe from potential clients who want to see "everything" or go "everywhere". After I groan a bit (sorry - but I am being honest) I then say, "Great! Sounds fabulous. How long do you have to travel?"

"We have a week, maybe ten days."

I then take a deep breath and start explaining how that it is not possible to "see everything" in 7-10 days. Europe is a small continent but not THAT small.