Books like The Last Boy and Girl in the World
Siobhan Vivian
The Last Boy and Girl in the World is 432 pages, about 7 hours 55 minutes at 250 words a minute.
12 books to read next
How long each takes
The Clique 4.0 h 
The Little Prince 1.8 h 
If He Had Been With Me 6.8 h 
They Both Die at the End 7.0 h 
We Were Liars 4.4 h 
P.S. I Still Love You 6.5 h 
Iris and Walter 47 min 
The Nameless City 4.4 h 
Thousand Questions 5.9 h 
I Am Number Four 8.1 h 
Her Royal Highness 5.4 h 
Girl Online 6.5 h Bar height shows length. Estimated at 250 words a minute.