Books like Happy Birthday to You!
Dr. Seuss
Happy Birthday to You! is 64 pages, about 1 hour 10 minutes at 250 words a minute.
7 books to read next
How long each takes
Monster Party! 24 min 
Bear's Busy Family 31 min 
The Eleventh Hour 35 min 
Flower Garden 35 min 
Madeline in London 1.0 h 
The Berenstain Bears' Birthday Boy 35 min 
Let's Learn Readers 18 min Bar height shows length. Estimated at 250 words a minute.