New York Mets · 2B · Free agency eligible
Marcus Semien has an estimated 12 years and 127 days of major league service time — 12.127 in the notation clubs use, from 2191 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2013 | Chicago White Sox | 28 | 0.028 | From transactions |
| 2014 | Chicago White Sox | 99 | 0.127 | From transactions |
| 2015 | Oakland Athletics | 172 | 1.127 | Carried forward |
| 2016 | Oakland Athletics | 172 | 2.127 | From transactions |
| 2017 | Oakland Athletics | 172 | 3.127 | From transactions |
| 2018 | Oakland Athletics | 172 | 4.127 | From transactions |
| 2019 | Oakland Athletics | 172 | 5.127 | Carried forward |
| 2020 | Oakland Athletics | 172 | 6.127 | From transactions |
| 2021 | Toronto Blue Jays | 172 | 7.127 | From transactions |
| 2022 | Texas Rangers | 172 | 8.127 | Carried forward |
| 2023 | Texas Rangers | 172 | 9.127 | Carried forward |
| 2024 | Texas Rangers | 172 | 10.127 | Carried forward |
| 2025 | Texas Rangers | 172 | 11.127 | From transactions |
| 2026 | New York Mets | 172 | 12.127 | 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.