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Sounds a bit delusional to me that you can just "teach someone data structures in 1 hour".

Also the role specifics matter here. It might be ok to bring in a junior who needs lots of mentoring onboard. For a tech lead who is going to be driving the direction of a team, I'd expect them to be up to speed and autonomous very quickly.

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I don't think "I can teach someone data structures in 1 hour" is a good faith interpretation of what OP meant. I would expect it's more like "I could teach someone about a data structure that could be used to solve this problem efficiently and simply in 1 hour" is closer to the mark.

It's not "teach someone data structures in 1 hour", but teach them the approach needed for that problem in 1 hour.

And it's a pretty insightful comment, because being able to be taught a practically useful algorithm, and use it on a question, in just an hour is a sign of a good candidate. Interviews should often be run just like that.

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