How long did Hitler spend on the occupation of the country along the Arkhangelsk-Volga line?

Hitler hoped to push the Soviet troops back across the Arkhangelsk-Volga line in four to five months, and six months after the start of Operation Barbarossa, Transcaucasia was to be conquered. Further, the positional stage was to begin, during which the military leadership of the Third Reich was to draw up a plan for further hostilities. After the defeat near Moscow, it became obvious that the operation had failed, and the war would drag on in any case. Hitler did not take into account the military power of the army of the Soviet Union, its cohesion and the possession of significant human and material resources.