Each county superintendent is entitled to the compensation set by the county board. The salary of a county superintendent may not be decreased during the superintendent’s term of office. Each county superintendent shall devote full time to public school business. In Anne Arundel County, the county board may not pay monetary compensation to the county superintendent for sick leave benefits earned while employed by any other board of education or public school system but may allow the county superintendent to use the sick leave in the same manner as sick leave accrued while employed by the county.