Rocksmith 2014

As the trophy description says, this has to be done in Learn A Song mode. If you play the game for the trophies, you might not even have got the 10-hour trophy by the time you have got most of the other trophies. You cannot speed this up but you can "auto-grind" it. Start up any song in Learn A Song and start any song, go to Riff Repeater by pressing , choose any section of the song and apply these settings:

• Difficulty - Any
• Speed - Any
• Difficulty repetitions - Infinite
• Level up - Any
• Speed repetitions - Infinite
• Accelerate - Any
• Auto-continue - Off
• Error tolerance - Any
• Master mode - Any
• View previous mistakes - Any

The game will now play for an infinite amount of time until you stop it yourself. The trophies will not pop during the session but after you have finished the song. I suggest when you are done auto-grinding, that you finish the song instead of quitting just to be sure that it saves.

Potential glitch:
This trophy, along with the 10 hour version of it, have glitched for some players on the PS4 version of the game. There is no confirmed solution yet, but it has worked for some to open riff repeater and from there exit the song.