Personnaly i beleive it could have allowed the war to go on longer than one or two months but that would require one thing, Hitler not trying to control what every single squad of men does.

He was a WW1 soilder who was not familiar with WW2 tactics, Thus he lost men and tanks in hopless battles.

In some cases battles could have been won if Hitler had allowed his Generals to move there men back to more defendable positions.

Hitler was stupid and tryed to hold every bit of ground when they could easily have falled back to defendable terrain.

And considering the amount of men they had on the Western front near the end of 1944 those extra 50,000 men and equiptment from Falaise alone would have made a big difference, Considering they had atleast some training compared to the troops of late 1944. Not mentioning the 180,000 men from the besieged ports.