I think the point is that some people don't acquire it within 5 or even more years. Think of a typical checked-out worker, without any specific ambition in professional life. There's plenty of people like that.

Some, possibly even most, never do.

Not who you’re asking, but it can take almost no time, or decades. It has nothing to do with years.

I know people with 20y that can’t do that.

I have worked with people who have 8-10 years of experience and are still mid-level in both skill and professionalism, know that they are, and are fine with it. They get their joy from other things in life and are totally fine coming into the office and doing the bare minimum to get by and going years without raises or bonuses because of it. Again, this is a conscious choice these people are making, they're not being taken advantage of or anything.

I work with a guy now who's a mid-senior level (senior is SDE4, he's a 3) nearing retirement. Happiest guy I know tbh

> Such a long time and a relatively low bar.

I've promoted juniors in months. I've also had people start, stay a few years and leave as a junior. It's all about learning and what work you take on. Also, I see this often when interviewing. 5+ years of experience looking for a junior role. Usually, it's either someone who did not learn and was not promoted, or it is someone from an company that did not let people work on important things because they were junior. So they stayed that way.