Duffy was shut down after his 20th Royals start because, including his time at Triple-A Omaha, he'd pitched 147 1/3 innings, and that was deemed enough for his rookie season.
His routine for the rest of the season will be to throw side sessions and work on improving the command of his pitches.
Any chance of his making a relief appearance?
"I wish, but no," Duffy said. "I think our bullpen has it under control. I'm chillin'. I'm not doing anything but cheering on the team and throwing some sides. Relax and rest, I guess. It's hard."
A dedicated runner, he'll be doing that every day.
But no relief outings, even in an emergency?
"Maybe, but I doubt it," manager Ned Yost said.