10s, 20s, and 30s.
10s- Childhood and J5, and Solo Motown stuff.
20s- The Jackson's, Developing with Quincy, The Wiz, Off The Wall ,Thriller, Victory, and Bad.
30s- Dangerous, the original allegations, the Chandlers declining to continue the infestation (I meant investigation but might as well leave it), and the HIStory, Blood on the Dance Floor eras.
That's a substantial amount of content and easily could drive a few hours of narrative.
Skipping the 40s, you lose Invincible and the Sony drama, which is honestly fine. And a lot of other unfortunate media snafus, including the Second set of allegations. But you also miss This Is It. Though you can easily still include that.