I fully understand the importance of taking out France as early as possible for a number of reasons, but like I said, I just wanted to see what would happen if I didn't.
I started the attack on Russia in May 1940 while France started its attack from the Maginot line. I should mention that all of the German units facing the Maginot line were upgraded before France started attacking.
To my surprise, the Allies declared war on Belgium in June of 1940 prompting me to send reinforcements from the East in the form of 2nd Hungarian Army and the 1st Hungarian Corps. With exception of Belgium finally falling in late November 1940, the Allies offensive in the West has largely been contained for now.
The situation in the West as of December 8, 1940 is as follow:





