Last with St. Louis Cardinals · CF · No longer on a 40-man roster
Jon Jay has an estimated 10 years and 144 days of major league service time — 10.144 in the notation clubs use, from 1864 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2010 | St. Louis Cardinals | 133 | 0.133 | From transactions |
| 2011 | St. Louis Cardinals | 172 | 1.133 | Carried forward |
| 2012 | St. Louis Cardinals | 172 | 2.133 | From transactions |
| 2013 | St. Louis Cardinals | 172 | 3.133 | Carried forward |
| 2014 | St. Louis Cardinals | 172 | 4.133 | Carried forward |
| 2015 | St. Louis Cardinals | 172 | 5.133 | From transactions |
| 2016 | San Diego Padres | 172 | 6.133 | From transactions |
| 2017 | Chicago Cubs | 172 | 7.133 | From transactions |
| 2018 | Arizona Diamondbacks, Kansas City Royals | 172 | 8.133 | From transactions |
| 2019 | Chicago White Sox | 172 | 9.133 | From transactions |
| 2020 | Arizona Diamondbacks | 172 | 10.133 | From transactions |
| 2021 | Los Angeles Angels | 11 | 10.144 | 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.