Last with Los Angeles Angels · P · No longer on a 40-man roster
Sean O'Sullivan has an estimated 2 years and 130 days of major league service time — 2.130 in the notation clubs use, from 474 days credited on a major league roster.
| Season | Club | Days | Running total | How this season is known |
|---|---|---|---|---|
| 2009 | Los Angeles Angels | 68 | 0.068 | From transactions |
| 2010 | Los Angeles Angels, Kansas City Royals | 95 | 0.163 | From transactions |
| 2011 | Kansas City Royals | 103 | 1.094 | From transactions |
| 2012 | Kansas City Royals, Toronto Blue Jays, San Diego Padres | 7 | 1.101 | From transactions |
| 2013 | San Diego Padres | 38 | 1.139 | From transactions |
| 2014 | Philadelphia Phillies | 28 | 1.167 | From transactions |
| 2015 | Philadelphia Phillies | 86 | 2.081 | From transactions |
| 2016 | Boston Red Sox | 49 | 2.130 | 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.