Last with Houston Astros · C · No longer on a 40-man roster
Jason Castro has an estimated 12 years and 104 days of major league service time — 12.104 in the notation clubs use, from 2168 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2010 | Houston Astros | 104 | 0.104 | From transactions |
| 2011 | Houston Astros | 172 | 1.104 | From transactions |
| 2012 | Houston Astros | 172 | 2.104 | From transactions |
| 2013 | Houston Astros | 172 | 3.104 | From transactions |
| 2014 | Houston Astros | 172 | 4.104 | Carried forward |
| 2015 | Houston Astros | 172 | 5.104 | From transactions |
| 2016 | Houston Astros | 172 | 6.104 | From transactions |
| 2017 | Minnesota Twins | 172 | 7.104 | From transactions |
| 2018 | Minnesota Twins | 172 | 8.104 | From transactions |
| 2019 | Minnesota Twins | 172 | 9.104 | From transactions |
| 2020 | Los Angeles Angels, San Diego Padres | 172 | 10.104 | From transactions |
| 2021 | Houston Astros | 172 | 11.104 | From transactions |
| 2022 | Houston Astros | 172 | 12.104 | 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.