Books like Judgement Day
Terry Pratchett, Ian Stewart, Jack Cohen
Judgement Day is 370 pages, about 6 hours 47 minutes at 250 words a minute.
12 books to read next
How long each takes
The Hobbit 5.7 h 
Starless Night 6.2 h 
The Elvenbane 7.6 h 
Siege of Darkness 6.5 h 
God's Secret Formula 4.0 h 
The Fall of Gondolin 5.5 h 
Streams of Silver 5.4 h 
The Icewind Dale Trilogy 18.9 h 
The Invisible Man 3.1 h 
Stone of Tears 14.1 h 
Promise of the Witch King 6.3 h 
Blood of the Fold 11.0 h Bar height shows length. Estimated at 250 words a minute.