School busses are on time if they arrive five minutes prior to the start of classes.
In our school this would be 8:40 am.
8:30-8:40 am: Entry (go to classroom immediately)
8:45 am: Morning Instruction Begins
10:15 am or 10:30 am: Recess
11:45 am-12:45 pm: Lunch
2:50 pm: End of Day Dismissal