Athletics · P · Free agency eligible
Mark Leiter Jr. has an estimated 7 years and 40 days of major league service time — 7.040 in the notation clubs use, from 1244 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2017 | Philadelphia Phillies | 135 | 0.135 | From transactions |
| 2018 | Toronto Blue Jays, Philadelphia Phillies | 120 | 1.083 | From transactions |
| 2019 | Toronto Blue Jays | 0 | 1.083 | From transactions |
| 2020 | Arizona Diamondbacks | 0 | 1.083 | From transactions |
| 2021 | Detroit Tigers, Chicago Cubs | 172 | 2.083 | From transactions |
| 2022 | Chicago Cubs | 129 | 3.040 | From transactions |
| 2023 | Chicago Cubs | 172 | 4.040 | From transactions |
| 2024 | Chicago Cubs, New York Yankees | 172 | 5.040 | From transactions |
| 2025 | New York Yankees | 172 | 6.040 | From transactions |
| 2026 | Oakland Athletics | 172 | 7.040 | 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.