It took only 4 years to build European school in RheinMain in Bad Vilbel, Germany:

2009 – Project idea launched
2010 – Town agrees to build school & rent it back
2011  – Baubeginn
2012/2013 – School opened
—-
= ~ 4 Years for a Quality Campus to be provided

Inauguration ceremony of the Europäiche Schule RheinMain in Bad Vilbel, Germany 2012-11-13

Premiere in der Europaschule

Whereas in Luxembourg it took more than 32 years ( from 1979 to 2012 ) to build a second School, in the wrong place, with the wrong type of split and in a building that has a lot to be desired.