It’s rather a very simple math formula based on the number of steps and parts.
I adjusted the formula by researching online what people reported as the time it took them to build some of the items. ie there’s a linear regression “fudge” factor - but it’s still an extremely simplified “model”, if you can call it that.
Very cool then, my personal experience and experience in general with assembling furniture could be different to what regular people who never did it before have, seen it with friends