Books like It's So Amazing!
Robie H. Harris
It's So Amazing! is 85 pages, about 1 hour 34 minutes at 250 words a minute.
9 books to read next
How long each takes
What's the Big Secret? 34 min 
Mommy Laid an Egg 35 min 
Where Did I Come From? 53 min 
Tell Me Why 8.8 h 
Sex Is a Funny Word 2.9 h 
Amazing You! 35 min 
El Deafo 4.4 h 
The Teenage Body Book 5.1 h 
Sex 3.5 h Bar height shows length. Estimated at 250 words a minute.