Assuming that Hitler started gassing Jews since day one, that makes for 3,153,600 minutes.
6,000,000 Jews killed during 3,153,600 minutes comes out to 1.9 jews per minute. That means that Hitler killed roughly one Jew every 30 seconds on average.
In Auschwitz, the most famous and biggest concentration camp there are 15 crematoriums.
According to Auschwitz survivors, Jews would go into the chamber, gassed for 15 - 20 minutes, then put into the oven.
It takes 1 hour to to cremate a body using modern furnaces which operate at much higher temperatures than the traditional ovens at the camp. However, lets say that the ovens operate at a level that we see today, that means it would take 1 hour and 20 minutes to gas and burn 15 Jews assuming they were all burned simultaneously. (Disregarding the time it would take for the gas to exit the chamber for the bodies to be transported from the chamber to the oven.) The elevators used to transport bodies were very slow and could take up 7 bodies at a time with their weight capacity. However, for our greatest ally we are going to assume that the bodies were teleported instantly from chamber to oven.
That means 15 Jews were gassed and burned every 1-1/2 hours. That comes out to exactly 300 jews every 24 hours (Assuming that the gassing and burning of jews was happening every hour straight for 6 years on an uninterrupted basis) the total # of killed Jews would be 657,000 for those 6 years. The official Jewish story is that 4,000,000 Jews were killed at Auschwitz alone.
