Seattle Mariners · 1B · Free agency eligible
Josh Naylor has an estimated 7 years and 104 days of major league service time — 7.104 in the notation clubs use, from 1308 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2019 | San Diego Padres | 118 | 0.118 | From transactions |
| 2020 | Cleveland Indians, San Diego Padres | 158 | 1.104 | From transactions |
| 2021 | Cleveland Indians | 172 | 2.104 | From transactions |
| 2022 | Cleveland Indians | 172 | 3.104 | From transactions |
| 2023 | Cleveland Indians | 172 | 4.104 | From transactions |
| 2024 | Cleveland Indians | 172 | 5.104 | From transactions |
| 2025 | Arizona Diamondbacks, Seattle Mariners | 172 | 6.104 | From transactions |
| 2026 | Seattle Mariners | 172 | 7.104 | 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.