Last with New York Yankees · CF · No longer on a 40-man roster
Mason Williams has an estimated 2 years and 69 days of major league service time — 2.069 in the notation clubs use, from 413 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2015 | New York Yankees | 116 | 0.116 | From transactions |
| 2016 | New York Yankees | 125 | 1.069 | From transactions |
| 2017 | New York Yankees | 10 | 1.079 | From transactions |
| 2018 | Cincinnati Reds | 68 | 1.147 | From transactions |
| 2019 | Baltimore Orioles | 27 | 2.002 | From transactions |
| 2020 | Baltimore Orioles | 47 | 2.049 | From transactions |
| 2021 | New York Mets | 20 | 2.069 | 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.