How did Ender spend his final time on Eros?

Ender was awarded the rank of Admiral, so he had free reign to watch the videos of his fights with Stilson and Bonzo as well as their corpses, which were displayed at Colonel Graff's court-martial. This is how he spends his final days on Eros. Ender finds it amusing that he killed 10 billion buggers, with queens that were as sentient and intelligent as human beings, but that this was not considered a crime.