Jon Heyman of CBSSports.com hears that the Cubs will be patient with Anthony Rizzo and that a promotion isn’t likely this month (Twitter link). The Cubs acquired the first base prospect from the Padres for Andrew Cashner last offseason, but first baseman Bryan LaHair is hitting well at the MLB level.
The season ends on October 3. If you assume he doesn't get called up until June, that's 30 + 31 + 31 + 30 + 3 days of season, or 123 days. That means that to keep that seventh year in play, Rizzo cannot be called up until around June 23 or so. DL time does count towards service time so they can't fake an injury. If they really just want him up for interleague they can try to send him back down for seasoning until after the ASG, but once he's up, he's up. The players' union wouldn't take too kindly to a send down just to suppress service time.
Its just common sense.
You don't want to lose that extra year. That's why I can't believe the Nationals called up Harper so quick. They should have just signed some loser knowing he's fail then called up Harper.
I thought they were able to avoid the extra year with Harper. He was called up on April 28, which mean that 23 or 24 days of the season had passed. There are only 30 + 31 + 30 + 31 + 31 + 30 + 3 = 186 days in the season and the player needs 172 to qualify for one year of service. I think Harper is a Super Two for sure but he'll still be there for 7 seasons under control.