How Long Does It Really Take to Make a Friend?

I stumbled upon a University of Kansas study done in 2018 that suggests the number of hours spent together it takes for two people to become casual friends (40-60 hours), “regular” friends (80-100 hours), and close friends (200 hours).

I’m sure most people aren’t counting how many hours they’ve spent with the people they’re friends with, but do these numbers seem really high to anyone else?

For example, with a new friend of mine, we’ve only spent maybe 20 “quality” hours together (where we’re conversing one-on-one or doing stuff with one another), but we’re already casual friends. We both have referred to each other as friends, we hang out together on occasion, and we even share some things about our personal lives (which is arguably deeper than just casual friendship).

So my question is, do you find this study to be accurate? What factors might influence whether two people become friends faster or slower than the aforementioned time in the study?