During a recent interview with MTV, Royce Da 5'9 shed light on Eminem's serious work ethic in the studio.  Royce spoke highly of Em for his level of dedication and focus that he has when it comes to recording songs.  As Royce put it, Eminem "never really stops recording."

"Marshall is the type that never really stops recording, so when you get in the studio he's in the back room where the booth is and the door is locked.  "Nobody's allowed back there, nobody ever knows what he's doing. All I know is that he's constantly working, so if he told me that he had an album ready right now, I would believe him because he's like a work horse. He works every day."

Source: sohh.com