Last with Chicago Cubs · C · No longer on a 40-man roster
Welington Castillo has an estimated 8 years and 7 days of major league service time — 8.007 in the notation clubs use, from 1383 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2010 | Chicago Cubs | 45 | 0.045 | From transactions |
| 2011 | Chicago Cubs | 18 | 0.063 | From transactions |
| 2012 | Chicago Cubs | 116 | 1.007 | From transactions |
| 2013 | Chicago Cubs | 172 | 2.007 | From transactions |
| 2014 | Chicago Cubs | 172 | 3.007 | From transactions |
| 2015 | Arizona Diamondbacks, Chicago Cubs, Seattle Mariners | 172 | 4.007 | From transactions |
| 2016 | Arizona Diamondbacks | 172 | 5.007 | From transactions |
| 2017 | Baltimore Orioles | 172 | 6.007 | From transactions |
| 2018 | Chicago White Sox | 172 | 7.007 | From transactions |
| 2019 | Chicago White Sox | 172 | 8.007 | 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.