The devotions are the perfect length for my 3 and 5 year old. They love animals and it is easy for them to relate to the stories. It is a great introduction to scripture. The questions help with reading comprehension and critical thinking. Each devotions is tied to a key scripture reference. We usually add to the lesson by showing the girls a 30 second video of the animal after the devotion.
My 5-year old son so enjoyed the first '5 minute devotions' that we are getting him this one for Christmas. It does have some repeats, but a lot of other stories, as well. The stories are short enough for his 3 year old brother to sit still for with good questions at the end.