Books like Homme Qui Plantait des Arbres
Jean Giono
Homme Qui Plantait des Arbres is 53 pages, about 58 minutes at 250 words a minute.
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How long each takes
Red Leaf, Yellow Leaf 44 min 
The Tree Lady 35 min 
Tree of Life 35 min 
Aani and the Tree Huggers 35 min 
Hans Christian Andersen's The Fir Tree 34 min 
Toby and the Secrets of the Tree 7.6 h Bar height shows length. Estimated at 250 words a minute.