This document provides information about minutes lost during lessons due to late pupil arrival and other factors. It notes that the teacher's lesson started at 10:30 but pupils arrived at 10:34, wasting 4 minutes. Further minutes are lost to the first learning task and throughout the term and school year, totaling up to 540 minutes or 9 missed lessons over the course of an academic year. The document advocates for not losing any minutes of lesson time.