around 16h h for the main story and around 58h h for 100% completion, based on community completion data on GameChart.
Armored Core VI: Fires of Rubicon has 5 chapters with 53 missions recorded. Players rate every chapter on GameChart.
Community ratings put "Chapter 1" as the lowest-rated chapter (8.0/10 across 1 votes), while "Chapter 5" scores highest (9.0/10).