The MOST effective classrooms clocked 134 minutes a day of students reading and writing. This, of course, does not include teacher talk or talk about the reading.

In the average intervention 30 minute lesson, 23 minutes of reading need to occur so that instructional time is 75% reading.  The other pieces need to be tight and fast.

Effective Schools Studies, Allington, Pearson, Pressley, Johnston, 2006