Last with Boston Red Sox · C · No longer on a 40-man roster
Blake Swihart has an estimated 3 years and 133 days of major league service time — 3.133 in the notation clubs use, from 649 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2015 | Boston Red Sox | 156 | 0.156 | From transactions |
| 2016 | Boston Red Sox | 148 | 1.132 | From transactions |
| 2017 | Boston Red Sox | 31 | 1.163 | From transactions |
| 2018 | Boston Red Sox | 172 | 2.163 | From transactions |
| 2019 | Arizona Diamondbacks, Boston Red Sox | 142 | 3.133 | From transactions |
| 2020 | Texas Rangers | 0 | 3.133 | 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.