Parental controls limit time is not enough for online lessons
There's maximum of 8 hours I can limit online time from parental controls, 4 hours is spent during lessons, then after 13:00 there's 4 hours left but at 18:00 my child has private lesson for 1 hour, so he has to be responsible to spare some remaining time for private 1 hour, but you know it's impossible :) He'll spend it by playing online games. So, out of lessons we need 5-6 hours extra, so the limit of maximum 8 should be 10 or 12 hours better. Instead of increasing max time (but more difficult to implement as I'm sw developer) there can be definition of internet addresses(eg. online lesson systems' addresses) which doesn't count for online time