I totally agree any schools first priority is the safety of each child apart from that, at this peak summer a child is leaving home by 6.15 am and returns by 3.00pm what is left in the child in this weather.If the classes gets over by 1 or 2 hours earlier in what way will it effect a child daily education.
Secondly many childrens are into extra curricular activitys after the school hours , I mean they will definitely be in a comfort zone along with their daily studys which they have to do after returning from school.