Why bother with SimHBD, let's go straight to releasing StudentHBD.
On a less funny note, my current understanding of the mechanics is that minting a citizen puts you on a 24-hour cooldown. That means you do not get 87% every day. When you miss one day, you get the full chance the next day. When you hit, your next day's chance is reduced. The later (in whatever you consider a day) you mint, the bigger the reduction.
🤔😯