Last with Seattle Mariners · LF · No longer on a 40-man roster
Guillermo Heredia has an estimated 5 years and 111 days of major league service time — 5.111 in the notation clubs use, from 971 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2016 | Seattle Mariners | 54 | 0.054 | From transactions |
| 2017 | Seattle Mariners | 172 | 1.054 | Carried forward |
| 2018 | Seattle Mariners | 171 | 2.053 | From transactions |
| 2019 | Tampa Bay Rays | 172 | 3.053 | From transactions |
| 2020 | New York Mets, Pittsburgh Pirates | 58 | 3.111 | From transactions |
| 2021 | Atlanta Braves | 172 | 4.111 | From transactions |
| 2022 | Atlanta Braves | 172 | 5.111 | 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.