Last with Chicago White Sox · P · No longer on a 40-man roster
Frankie Montas has an estimated 8 years and 84 days of major league service time — 8.084 in the notation clubs use, from 1460 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2015 | Chicago White Sox | 34 | 0.034 | From transactions |
| 2016 | Los Angeles Dodgers, Oakland Athletics | 70 | 0.104 | From transactions |
| 2017 | Oakland Athletics | 80 | 1.012 | From transactions |
| 2018 | Oakland Athletics | 72 | 1.084 | From transactions |
| 2019 | Oakland Athletics | 172 | 2.084 | From transactions |
| 2020 | Oakland Athletics | 172 | 3.084 | From transactions |
| 2021 | Oakland Athletics | 172 | 4.084 | From transactions |
| 2022 | Oakland Athletics, New York Yankees | 172 | 5.084 | From transactions |
| 2023 | New York Yankees | 172 | 6.084 | From transactions |
| 2024 | Cincinnati Reds, Milwaukee Brewers | 172 | 7.084 | From transactions |
| 2025 | New York Mets | 172 | 8.084 | 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.