Yes but Hitler’s constant strategic blundering and over-ruling his generals advice most likely succeeded in shoertening the war, not prolonging it. Imagine if Hitler had permitted FM Paulus to break out of the Stalingrad pocket or had withdrawn FM Rommel’s Afrika Corp from Tunisia. These armies would have been able to regroup and fight again and therefore prolong the war. Hitler’s blundering was so obvious that the Allies eventually gave up their plots to assassinate him, they figured he was more valuable alive than dead. Meanwhile, many high ranking officers in the German Wehrmacht took precisely the opposite view which of course lead to the July 20th 1944 Bomb Plot, almost entirely instigated by high ranking German military officers.
Hitler already knew the 6th army was finished even before the Russian trap was complete. General Halder warned Hitler that he didn't have the resources to take Stalingrad and the Caucuses. He told Hitler that his exposed flanks, mainly manned by “Satellite Armies” were in danger of a Soviet offensive that would be a disaster. Hitler reacted as one would expect of him, he fired Halder and appointed a dedicated Nazi to Chief of Staff. A withdrawal from Stalingrad would have resulted in a rout. The 6Th Army occupied many Soviet Armies which could have been used in the Ukraine.