What year was Hitler in reign?

Answer 1

It depends entirely on which country "this country" refers to. Hitler was the ruler of Germany from 1933-1945, but other countries were invaded or co-opted at different periods. There are also examples, like Hungary, that served as Nazi Allies prior to a direct German invasion.

Answer 2

12 years 3 months, from 30 January 1933 - 30 April 1945

Answer 3

1933 to 1945 in Germany.

Answer 4

From 1934 to 1945.