My dh says that our son does to many activities, however having casually chatted to other school mums in RL it appears he is only doing what the others are doing (and this is why he does the activities he does as his friends invite him to join them).
He currently does:
Mon - ASC to 6pm
Tue - ASC to 6pm
Thu - ASC to 5pm
Sat - music conservatoire
Sun - rugby
However rugby has now come to an end and he'd like to start this:
Mon - Cricket after ASC
Tue - ASC
Wed - Football
Thu - ASC to 5pm
Fri - Cricket
Sat - Music
Sun - day of rest!!! 
AIBU to allow him to do this, or is DH right and it's too much?