Athletics · C · Arbitration eligible
Jonah Heim has an estimated 5 years and 137 days of major league service time — 5.137 in the notation clubs use, from 997 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2020 | Oakland Athletics | 97 | 0.097 | From transactions |
| 2021 | Texas Rangers | 172 | 1.097 | From transactions |
| 2022 | Texas Rangers | 172 | 2.097 | From transactions |
| 2023 | Texas Rangers | 172 | 3.097 | From transactions |
| 2024 | Texas Rangers | 172 | 4.097 | From transactions |
| 2025 | Texas Rangers | 172 | 5.097 | From transactions |
| 2026 | Oakland Athletics, Atlanta Braves | 40 | 5.137 | 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.