around 27h h for the main story and around 158h h for 100% completion, based on community completion data on GameChart.
Fallout 4 has 8 chapters with 96 missions recorded. Players rate every chapter on GameChart.
Community ratings put "Minutemen Quests" as the lowest-rated chapter (6.0/10 across 1 votes), while "Vault-Tec Workshop DLC" scores highest (10.0/10).