I'm thinking when I get to it tonight I'm going to start replaying through some characters while I clean up my S-ranks, missed bonus objectives, etc. I'm just so engrossed in the game that even though I'm done, I don't want it to be over. While the story wrapped up most everything I wanted well enough, I think rewatching the experience I just had with the knowledge I now have will be a lot of fun.
I'm sure I had a couple idle hours here and there but I finished the game at 41 hours, by the way. I know I'm slower than others typically, but I struggle to see it as a "20 hour game" that a lot of people seem to think it is. Of course, I also see people talk about the game being a breeze even on Intense, but I probably saw 3 or 4 game overs, not counting that I died 4 times on the last mission before knocking the difficulty down so I could finish and go to bed. And I bet I've got 5 or 6 missions I still need to S rank.
Gonna take me 45 hours, I plan on playing the game by "all events" once I'm done with with Hijiyama & Gouto.