Last with St. Louis Cardinals · P · No longer on a 40-man roster
Seunghwan Oh has an estimated 3 years and 125 days of major league service time — 3.125 in the notation clubs use, from 641 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2016 | St. Louis Cardinals | 172 | 1.000 | From transactions |
| 2017 | St. Louis Cardinals | 172 | 2.000 | From transactions |
| 2018 | Colorado Rockies, Toronto Blue Jays | 172 | 3.000 | From transactions |
| 2019 | Colorado Rockies | 125 | 3.125 | 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.