Here are the rules. Service Time (MLB) - CBARules Also, Liriano was under team control for seven years (2006, 2007, 2008, 2009, 2010, 2011, 2012). An interesting situation because I was under the impression that if a player went on the DL with the MLB club, he continued to accrue service time. Maybe that changes at the end of the season, at which point he can be "sent down" and then DLed? edit: his 2007 season must have counted as service time. He has 6.1 years of service, which looks about right if you start the clock mid-season 2006 and continue through 2008, at which point his clock stopped when he went back to the minors. Resume later that season and that puts you somewhere around six years today. So, yeah, you can keep a player longer than six years but it takes more than a few weeks of minor league time to do it. Maybe half a season... Which doesn't really "solve" the Gibson debate, because he will probably end somewhere around half a season of service time.