Last with Texas Rangers · P · No longer on a 40-man roster
Guillermo Moscoso has an estimated 2 years and 33 days of major league service time — 2.033 in the notation clubs use, from 377 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2009 | Texas Rangers | 55 | 0.055 | From transactions |
| 2010 | Texas Rangers | 19 | 0.074 | From transactions |
| 2011 | Oakland Athletics | 116 | 1.018 | From transactions |
| 2012 | Colorado Rockies | 122 | 1.140 | From transactions |
| 2013 | San Francisco Giants | 65 | 2.033 | 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.