Triple S for every song, icluding all DLC? Awesome.
Anyway, as far as I can tell, the clock isn't ticking when you don't play. For example, when in the museum, I noticed that the game doesn't count the time. So, you dio need to play the next twenty hours. And if you don't have a Triple S by now... well, give it a try. Nothing I'd ever do, but at least you get the trophy, I guess.
SSS'd every song but the ultimates and I really don't feel like putting myself through that frustration. I wish there was some way I could just leave the game on and let hours pile up. Music player mode maybe?