If he doesn't want to invest a lot of time in recruiting, Jon Gruden has the luxury of letting his fame and asst coaches do most of it for him.
We sign 20-30 recruits each year, and pitch to another 50 or more. For discussion's sake, make it an even 100 high school players we actively engage each recruiting season.
Half of those will never get past the position coach / primary recruiter stage.
So Jon's going to be called in to to be the big gun maybe 50 times a year. Half those will be phone calls.
So he's actually traveling to a recruit's home and sitting in the living room talking to parents (usually to close a deal, occasionally to sway one that's gone south) maybe 20-25 times a year.
20-25 days committed to recruiting, plus some number of hours making phone calls and texting, in a 365 day year, that's not a super-heavy load.
It's not an obstacle to coaching at the college level, even if he doesn't relish the duty.