How would this process scale to a history book that requires detailed research and weighting conflicting sources of the same event without bias? For example wr

How would this process scale to a history book that requires detailed research and weighting conflicting sources of the same event without bias? For example write me a book on Russia's annexation of Crimea & war in Eastern Ukraine. There's at least 4000 hours of research there, interviewing people in an active war zone and collecting 10,000's of sources, it would take years. If anything this is where this approach would work, there's far more analysts and editors out there than writers with a heroic sense of duty.