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I don't remotely understand how.

You literally can get good at leetcode with an hour a day for a couple of months provided you studied computer science or even just like took AP Computer Science in high school. And even that just requires an internet connection.

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How do you not understand that many people with families or other external obligations wouldn’t have the luxury of spending 7 hours a week for multiple months on leetcode?

Like everything else, it's an opportunity cost. Personally, I think LC is a great return on time invested. It takes far less time and money than say, any of the traditional gatekeepers, even for example a CS degree, or even perhaps a good data structures and algorithms class that is semester long.

If they need to spend that level of time in order to do a few search or sort problems on a whiteboard I'd be concerned that they don't actually know algorithms or datastructures.

The kinds of questions most companies ask are not hard.

I am 35 years old and never even heard if a high school computer science course. I spent one period of my last semester assisting the network admin with maintenance tasks, which was the closest thing we had to AP computer anything, and only 2 students in my class had the privilege.

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