I don’t give my kids meds at school.  I give them their meds when they wake up,  about 7:30 school days, after school 3:00 and at bedtime, between 8:30 and 10:00 PM.  This has worked fin for us-  my kids levels are good.  It really depends on the child on how often they need to be dosed.  I am sure it depends on if the child has any enzyme activity and how rapidly they clear the cortef.

 

Good luck.