Detroit Tigers · P · Free agency eligible
Kenley Jansen has an estimated 16 years and 73 days of major league service time — 16.073 in the notation clubs use, from 2825 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2010 | Los Angeles Dodgers | 73 | 0.073 | From transactions |
| 2011 | Los Angeles Dodgers | 172 | 1.073 | From transactions |
| 2012 | Los Angeles Dodgers | 172 | 2.073 | Carried forward |
| 2013 | Los Angeles Dodgers | 172 | 3.073 | Carried forward |
| 2014 | Los Angeles Dodgers | 172 | 4.073 | Carried forward |
| 2015 | Los Angeles Dodgers | 172 | 5.073 | From transactions |
| 2016 | Los Angeles Dodgers | 172 | 6.073 | From transactions |
| 2017 | Los Angeles Dodgers | 172 | 7.073 | From transactions |
| 2018 | Los Angeles Dodgers | 172 | 8.073 | From transactions |
| 2019 | Los Angeles Dodgers | 172 | 9.073 | Carried forward |
| 2020 | Los Angeles Dodgers | 172 | 10.073 | Carried forward |
| 2021 | Los Angeles Dodgers | 172 | 11.073 | From transactions |
| 2022 | Atlanta Braves | 172 | 12.073 | From transactions |
| 2023 | Boston Red Sox | 172 | 13.073 | From transactions |
| 2024 | Boston Red Sox | 172 | 14.073 | From transactions |
| 2025 | Los Angeles Angels | 172 | 15.073 | From transactions |
| 2026 | Detroit Tigers | 172 | 16.073 | From transactions |
172 days credit a full year, so a season adds at most 1.000 no matter how long a player is on a roster. 3.000 years reaches salary arbitration and 6.000 reaches free agency —
what every threshold unlocks.
This figure is an estimate reconstructed from public roster
transaction records. It is not an official MLB or MLBPA figure — those are
not published. See the
methodology.
Last updated 2026-10-12.
Independent project, not affiliated with or endorsed by Major League
Baseball or the MLBPA.