What is significant about the fact that the Holocaust took place over a 12-year time period?

The 12 year period signifies the prosecution and murder of Jews by the Nazis regime and it's collaborators between the year 1933 to 1945.

Explanation:

Most Holocaust historians called the Holocaust as the genocide carried out on European Jews by Nazi Germany and its perpetrators from the year 1941 and 1945.

According to Michael Gray who is a specialist in Holocaust Education, he acknowledges three significant of the Holocaust that took place over a 12 year period

The Murder and trial carried out by the Nazis and their perpetrators towards the of Jews by the Nazis in year 1933 to 1945 The organized mass murder of the Jews by the Nazi authorities and its perpetrators in the 1941 to 1945, this also excludes victims before 1941 that were murdered. The trial and murder of different groups by the Nazi authorities and its perpetrators from the year 1933 to 1945, which included victims of Nazis'. this also signify the annihilation of the Jews.

Because we can see that the Holocaust was a process, and not something that suddenly appears in the mind of Adolf Hitler, but a premeditated and structured process.

Explanation:

Nazi ideology held that the Jews were largely to blame for the difficult economic situation in which the country found itself since the defeat in the World War I, and, in 1935, initiated policies of persecution and social segregation of this population with the so-called Laws of Nuremberg. When the World War II began, the persecution increased.