Last with Seattle Mariners · P · No longer on a 40-man roster
Hisashi Iwakuma has an estimated 5 years and 167 days of major league service time — 5.167 in the notation clubs use, from 1027 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2012 | Seattle Mariners | 167 | 0.167 | From transactions |
| 2013 | Seattle Mariners | 172 | 1.167 | Carried forward |
| 2014 | Seattle Mariners | 172 | 2.167 | From transactions |
| 2015 | Seattle Mariners | 172 | 3.167 | From transactions |
| 2016 | Seattle Mariners | 172 | 4.167 | Carried forward |
| 2017 | Seattle Mariners | 172 | 5.167 | 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.