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If anything, I'd say your book is too short for that age. 3rd grade is 8-years-olds, right? At that age, 25 minutes to read out loud is closer to one chapter of a book they'd be reading. At 8 year...
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#2: Initial revision
If anything, I'd say your book is too short for that age. 3rd grade is 8-years-olds, right? At that age, 25 minutes to read out loud is closer to **one chapter** of a book they'd be reading. At 8 years old, my favourite books were _[Sans Famille](https://en.wikipedia.org/wiki/Sans_Famille)_, _White Fang_ and Narnia (all of it, except for the last book, which my parents decided was inappropriate). _King Matt the First_, _The Wizard of Oz_ (with all the sequels) and _Marry Poppins_ (all of them, again) were already behind me. My Nephew, who's 9 now, has already finished the first four Harry Potters, after which the content became too adult for him - the length was just fine. So there's your sampling of length you can be aiming for. A book that can be read from start to finish in 25 minutes sounds to me like something for 4-years-olds, but even for them you don't have to limit yourself to something that short. _Winnie the Pooh_, which @ArcanistLupus mentions, or _Peter Pan_, are also quite appropriate for that age.