How many children's books do you read a day?

I am just wondering how often/how long/how many childrens books you read in a day?

I find I spend most of the day reading childrens books to my daughter. I read about 40 or 50 books a day (sometimes the same book over and over again) She cries if I stop. I have to strongly encourage her to play with toys instead of books.

What is reasonable?

http://forum.brillkids.com/teaching-your-child-to-read/how-many-books-a-day/