Books like Swamp Thing Saga of the Swamp Thing
Alan Moore, Stephen Bissette
Swamp Thing Saga of the Swamp Thing is 204 pages, about 3 hours 44 minutes at 250 words a minute.
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How long each takes
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Batman 2.4 h 
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Kurt Busiek's Astro City 3.6 h 
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Song of Susannah 8.5 h 
Batman 3.3 h Bar height shows length. Estimated at 250 words a minute.