[quote]How many years ago did the Precursors Disappear?[/quote]Approximately 10,000,000 [quote]Counting Cryosleep, Around how many years old is Master Chief Petty Officer John-117?[/quote]By Halo 4 he was 46 years old. [quote]How many hours/days did the entire Game Halo 3: ODST cover?[/quote]Less than a day, but more than 6 hours. Excluding the Epilogue. [quote]What caused the Elites to revel against the Hierarchs?[/quote]The slaughtering of the Sangheili High Council. [quote]What is Ironic about the Hierarchs' titles?[/quote]They're opposites of how they behave/act.