Last with Washington Nationals · P · No longer on a 40-man roster
Nate Karns has an estimated 4 years and 163 days of major league service time — 4.163 in the notation clubs use, from 851 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2013 | Washington Nationals | 16 | 0.016 | From transactions |
| 2014 | Tampa Bay Rays | 19 | 0.035 | From transactions |
| 2015 | Tampa Bay Rays | 172 | 1.035 | From transactions |
| 2016 | Seattle Mariners | 172 | 2.035 | From transactions |
| 2017 | Kansas City Royals | 172 | 3.035 | From transactions |
| 2018 | Kansas City Royals | 172 | 4.035 | From transactions |
| 2019 | Baltimore Orioles | 128 | 4.163 | 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.