Why is the earliest start time so early? Why is the latest start time so late?

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The start and end times in the proposed schedule enable us to complete the school day between the hours of 7:20 a.m. and 4:10 p.m.  

If the schedule were to be adjusted 20 minutes later in the morning to give Tier 1 students and families a slightly later start, many students in Tier 3 would not arrive home until after 5 p.m. If the schedule were to be adjusted 20 minutes the other direction to get Tier 3 students home earlier, Tier 1 students and families would have to rise even earlier and families would have to adjust to accommodate their students arriving home before 2 p.m. 

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