It doesn´t always take months to make a great operation...

In february 1940, General Nikolaus von Falkenhorst (Kn.Cross 30.04.1940) was given the important task to plan the invasion of Norway. He was to invade both Denmark and Norway as quickly as possible. In five hours he had made a rough sketch of the invasion , presented it to Hitler, and was given order to proceed developing his plans.

http://www.nuav.net/weserubung2.html

I read this as well in the book Hitler by Rupert Matthews so I knew to look for it in the net.

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