Tampa Bay Rays · P · Pre-arbitration
Jonathan Heasley has an estimated 1 year and 154 days of major league service time — 1.154 in the notation clubs use, from 326 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2021 | Kansas City Royals | 17 | 0.017 | From transactions |
| 2022 | Kansas City Royals | 125 | 0.142 | From transactions |
| 2023 | Kansas City Royals | 42 | 1.012 | From transactions |
| 2024 | Baltimore Orioles | 18 | 1.030 | From transactions |
| 2025 | Chicago White Sox, Kansas City Royals | 0 | 1.030 | From transactions |
| 2026 | Tampa Bay Rays | 124 | 1.154 | 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.