Last with Washington Nationals · C · No longer on a 40-man roster
Riley Adams has an estimated 4 years and 3 days of major league service time — 4.003 in the notation clubs use, from 691 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2021 | Washington Nationals, Toronto Blue Jays | 90 | 0.090 | From transactions |
| 2022 | Washington Nationals | 129 | 1.047 | From transactions |
| 2023 | Washington Nationals | 172 | 2.047 | From transactions |
| 2024 | Washington Nationals | 128 | 3.003 | From transactions |
| 2025 | Washington Nationals | 172 | 4.003 | From transactions |
| 2026 | Washington Nationals | 0 | 4.003 | 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.