Last with Colorado Rockies · P · No longer on a 40-man roster
Miguel Castro has an estimated 9 years of major league service time — 9.000 in the notation clubs use, from 1548 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2015 | Colorado Rockies, Toronto Blue Jays | 63 | 0.063 | From transactions |
| 2016 | Colorado Rockies | 74 | 0.137 | From transactions |
| 2017 | Baltimore Orioles | 111 | 1.076 | From transactions |
| 2018 | Baltimore Orioles | 172 | 2.076 | Carried forward |
| 2019 | Baltimore Orioles | 172 | 3.076 | Carried forward |
| 2020 | Baltimore Orioles, New York Mets | 172 | 4.076 | From transactions |
| 2021 | New York Mets | 172 | 5.076 | From transactions |
| 2022 | New York Yankees | 172 | 6.076 | From transactions |
| 2023 | Arizona Diamondbacks | 172 | 7.076 | From transactions |
| 2024 | Arizona Diamondbacks | 132 | 8.036 | From transactions |
| 2025 | Chicago White Sox | 136 | 9.000 | 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.