Boston Red Sox · 1B · Free agency eligible
Willson Contreras has an estimated 10 years and 108 days of major league service time — 10.108 in the notation clubs use, from 1828 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2016 | Chicago Cubs | 108 | 0.108 | From transactions |
| 2017 | Chicago Cubs | 172 | 1.108 | From transactions |
| 2018 | Chicago Cubs | 172 | 2.108 | Carried forward |
| 2019 | Chicago Cubs | 172 | 3.108 | From transactions |
| 2020 | Chicago Cubs | 172 | 4.108 | Carried forward |
| 2021 | Chicago Cubs | 172 | 5.108 | From transactions |
| 2022 | Chicago Cubs | 172 | 6.108 | From transactions |
| 2023 | St. Louis Cardinals | 172 | 7.108 | From transactions |
| 2024 | St. Louis Cardinals | 172 | 8.108 | From transactions |
| 2025 | St. Louis Cardinals | 172 | 9.108 | From transactions |
| 2026 | Boston Red Sox | 172 | 10.108 | 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.