How long did Herbert Hoover work under Warren G. Harding and Calvin Coolidge?

Herbert Hoover served in the Harding and Coolidge administrations from 1921 to 1928. He was appointed as the Secretary of Commerce by President Warren G. Harding and continued in that role under President Calvin Coolidge until 1928, totaling about seven years in the position. During this time, Hoover became known for his work in promoting various economic initiatives and coordinating federal efforts in areas such as trade and commerce.