why can i only earn 1 chest every 3 days?

Like most games, this game is streaky. I've had nights where i can't be beat and i've had nights that no matter what i do, or how well i play, my team just can't put together a win. So I got two S games today. I only earned one chest, I noticed on my summoner homepage that it says "2 days before next chest". WTF?! I binge play this game, weekends or nights when available. Having a family and work means my playtime is limited. There seems to be no reason for this restriction. So what if i earn all 4 of my monthly chest in one day? I still can't win more until the next month. Why parse them out like that? RITO PLZ.