Books like Who Killed Roger Ackroyd?
Pierre Bayard
Who Killed Roger Ackroyd? is 169 pages, about 3 hours 6 minutes at 250 words a minute.
12 books to read next
How long each takes
Poirot Investigates 3.5 h 
The Big Four 4.1 h 
Death in the Clouds 4.7 h 
Peril at End House 4.1 h 
Appointment with Death 4.1 h 
Curtain 4.4 h 
Death on the Nile 5.2 h 
One, Two, Buckle My Shoe 3.9 h 
Elephants Can Remember 4.4 h 
The Clocks 4.7 h 
Mrs. McGinty's Dead 4.3 h 
Third Girl 4.7 h Bar height shows length. Estimated at 250 words a minute.