Saturate

What's the general idea on colleges sending all acceptance emails out at the same time? I see people from here have already been accepted to the course I applied to at ETH Zurich, but I've yet to hear. My application was in on literally the last day possible so from that I reckon I'd hear after most people, but then each of the 3/4 people who've reported to here that they got accepted all received their emails on the same day. I know it's hard to know, but the wait is killing me.