AHC: Longest Possible Phoney War

For a period of several months after the invasion of Poland and the declaration of war by the Allies neither the Axis or the Allies made any large scale attempt to attack the other side. As well as phoney war it has been called "sitzkrieg", and the "Twilight War". It of course ended when using blitzkrieg tactics, Hitler was able to conquer his enemies in mainland Europe.
Your challenge is to make this non-war last for as long as possible. Bonus points if you can get the allies to be the first ones to go on the offensive.
 
Hitler dies in assassination attempt in November 1939 and his successor fail to or don't even attempt to secure peace afterward. Wehrmacht sits behind the Sigfried line, until in 1941 French army methodically advance with heavy tanks, thousands of airplanes and under heavy artillery. Unless German economy collapses under the strain of supplying large immobile army.
 
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