The advice to use specific times to encourage punctuality has been going around for decades, if not longer. I recall reading this advice in the 1970s.

I don't know if there's any basis for this practice in fact, but I know of at least one second-order effect: When someone invites me to a meeting at an odd time, I always presume they are making an effort to get everyone to show up on time, and that motivates me to make sure I'm not the straggler!

Does it have to do with the video game Dota 2? 322 is a famous number in the Dota community because a pro player once bet against himself for a payout of $322.

In college I woke up at 8:17; now I wake up at 5:53. Just seemed like good numbers!