I collected Otacon and Rosemary's radio from MGS4.
This time is also very long, but please listen to it when you have free time.
Not only radio but also some story play is included.
Set your PS3 clock to July 5th and you'll see a birthday cake added to Sunny's room.
00:00 ACT 1
30:29 Act 2
59:36 incompetent soldiers
1:01:35 Act 3
1:11:24 Act 4
1:44:02 Act 5
1:55:35 Rose psychological counseling
2:11:24 Sunny's appearance