Last with Kansas City Royals · P · No longer on a 40-man roster
Kelvin Herrera has an estimated 8 years and 6 days of major league service time — 8.006 in the notation clubs use, from 1382 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2011 | Kansas City Royals | 8 | 0.008 | From transactions |
| 2012 | Kansas City Royals | 172 | 1.008 | Carried forward |
| 2013 | Kansas City Royals | 148 | 1.156 | From transactions |
| 2014 | Kansas City Royals | 172 | 2.156 | Carried forward |
| 2015 | Kansas City Royals | 172 | 3.156 | From transactions |
| 2016 | Kansas City Royals | 172 | 4.156 | Carried forward |
| 2017 | Kansas City Royals | 172 | 5.156 | Carried forward |
| 2018 | Kansas City Royals, Washington Nationals | 172 | 6.156 | From transactions |
| 2019 | Chicago White Sox | 172 | 7.156 | From transactions |
| 2020 | Chicago White Sox | 22 | 8.006 | 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.