User blog comment:Viliam Furík/unlocking of customers on "random" day/@comment-6268337-20150801141030/@comment-6268337-20150801190659

The order of when customers who are not unlocked by a rank (excluding tutorial customers and those who just come in) is set, it's the days that they are unlocked that are not. The customers that are unlocked via rank are programmed to go when reaching a rank. So regardless of when you unlock them, it will always be in the order of Iggy, Utah, Shannon, and Mindy. Papa Louie could be unlocked anywhere between them.