Estimating the time to “read every Warhammer book” is tricky because:

• The franchise is enormous and spans multiple universes (Warhammer 40,000, Warhammer Age of Sigmar, and even the original Warhammer Fantasy before its reboot).
• The definition of “every book” can vary widely. Do you include only the narrative novels produced by the Black Library, or also rulebooks, codices, short story anthologies, audio dramas, and other tie‑ins?
• New titles continue to be released, so the total is a moving target.

That said, here’s one way to think about a rough estimate if you focus on the narrative novels:

1. Rough Totals
 • Warhammer 40,000: Black Library has published well over 600 novels and anthologies over the years (depending on what you count as a “book”). Some estimates put the number around 500–700 novels if you consider main series and spinoffs.
 • Warhammer Fantasy / Age of Sigmar: There are several hundred additional titles, though many Warhammer Fantasy novels have been “retired” or reworked in the Age of Sigmar relaunch. Estimate roughly another 200–300 titles.

For a very rough ballpark, say you have on the order of 800–1,000 individual narrative works.

2. Estimating Reading Time Per Title
Book lengths vary considerably. Some books in the Black Library line are around 250–300 pages, while others (especially epics and collections) can be considerably longer.
 • Suppose you average about 300 pages per book.
 • If your reading speed is around 50 pages per hour, that’s about 6 hours per book.
 • For 1,000 books, 1,000 × 6 hours = 6,000 hours of reading.

3. Putting It in Daily or Yearly Terms
Your actual time to finish depends on how many hours per day (or week) you can devote merely to reading. For instance:
 • At 1 hour per day: 6,000 days ≈ 16.4 years
 • At 2 hours per day: 6,000 ÷ 2 = 3,000 days ≈ 8.2 years
 • At 4 hours per day: 6,000 ÷ 4 = 1,500 days ≈ 4.1 years

4. Other Considerations
– Some books may be shorter (or longer) than 300 pages.
– This doesn’t include additional materials like rulebooks or background books that some fans also consider “essential reading.”
– If you factor in breaks, rereading for comprehension, or a more relaxed pace, the overall calendar time would be even longer.

5. Conclusion
Even under optimistic assumptions (about 1,000 novels at an average of 6 hours each), reading every Warhammer narrative title might take around 6,000 hours. Depending on how dedicated you are, that could translate to roughly 4 years (if reading 4 hours every day) to over 16 years (if reading 1 hour per day).

So, while it really depends on which materials you include and your daily reading time, you’re looking at a long-term commitment spanning several years of dedicated reading if you aim to cover the entire Warhammer library.