A forum post called "Open Letter to Parents of League of Legends Players" sounds like the worst thing you could click on all week, but it turns out it's actually a very practical guide for parents, to help them stop making their kids look like arseholes.
It's all about parents yanking kids out of League in the middle of a game. Which to that parent, in their own home, might seem like a good idea, but which neglects the fact that such a decisive move can have crummy consequences for everyone else stuck in that game.
While it is admirable that you are teaching children some responsibility to schedules, please stop neglecting to teach them responsibility to other people. Unless your child is playing a Custom Game, his actions will permanently affect the statistics of up to 9 other people.
While it gets a little bossy in parts, the post is super useful as a guide for the parents of League players, as it also lets them know stuff like average playtimes, so that curfews and bedtimes can be planned accordingly.
Course, if the kid's old enough to be playing League of Legends, they're also old enough to be able to read a clock and make their own decisions, so you could also call it an "Open Letter To Kids Who Should Know Better".