Last with Cleveland Guardians · P · No longer on a 40-man roster
Carlos Hernández has an estimated 4 years and 75 days of major league service time — 4.075 in the notation clubs use, from 763 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2020 | Kansas City Royals | 81 | 0.081 | From transactions |
| 2021 | Kansas City Royals | 132 | 1.041 | From transactions |
| 2022 | Kansas City Royals | 99 | 1.140 | From transactions |
| 2023 | Kansas City Royals | 172 | 2.140 | Carried forward |
| 2024 | Kansas City Royals | 133 | 3.101 | From transactions |
| 2025 | Cleveland Indians, Detroit Tigers, Philadelphia Phillies | 143 | 4.072 | From transactions |
| 2026 | Cleveland Indians | 3 | 4.075 | 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.