Last with Cincinnati Reds · CF · No longer on a 40-man roster
Billy Hamilton has an estimated 9 years and 95 days of major league service time — 9.095 in the notation clubs use, from 1643 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2013 | Cincinnati Reds | 29 | 0.029 | From transactions |
| 2014 | Cincinnati Reds | 172 | 1.029 | Carried forward |
| 2015 | Cincinnati Reds | 172 | 2.029 | From transactions |
| 2016 | Cincinnati Reds | 172 | 3.029 | From transactions |
| 2017 | Cincinnati Reds | 172 | 4.029 | From transactions |
| 2018 | Cincinnati Reds | 172 | 5.029 | From transactions |
| 2019 | Kansas City Royals, Atlanta Braves | 172 | 6.029 | From transactions |
| 2020 | Chicago Cubs, New York Mets | 172 | 7.029 | From transactions |
| 2021 | Chicago White Sox | 172 | 8.029 | From transactions |
| 2022 | Minnesota Twins, Miami Marlins | 162 | 9.019 | From transactions |
| 2023 | Chicago White Sox | 76 | 9.095 | 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.