I believe that speed was the objective for capturing Moscow... In this "what if", if reserves are brought to reinforce the German side, how much time would that take?

And during this time, ( at which the Germans are waiting for the reinforcements if at all) Do the Russians get their reinforcements?

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler