The phrase "entire tenure" refers to the entire time period that someone holds a specific position or role. It means the duration from when they start until they finish or leave that position. Full definition
Fixed or Floating interest rate: A fixed interest rate means that you will have to pay same EMI over a period of time (it may be fixed for entire tenure or it may be reset at fixed interval). (yourloanadvisors.com)
For nearly eight years, a stretch spanning Andrew Cuomo's entire tenure as governor, New York Democrats have found themselves in a uniquely bizarre and frustrating position: They've controlled the state Senate numerically but not practically, because of breakaway members who caucus with the Republicans. (nymag.com)
«The essential difference is Gifford's entire tenure â $ ¦ he was a declared candidate to run for city mayor,» said Assistant Majority Leader Lewis Fidler. (gothamgazette.com)