R.K.
Developmentally inappropriate. Storytime is not when children should be learning to sit quietly, but rather how to listen and interact with books. This is not going to help the children get ready for a quality preschool. They should be enagaging the children in choral reading, fill in the blanks for rhyming books, animal sounds, questioning to engage the children, etc.
I must say that if anyone in my book club read to the members for 30 minutes, without interaction from the rest, we'd have a very small book club. And we're not toddlers!