I usually allocate up to 20 minutes for that problem during the interview, maybe extending this to 30 minutes if they are not doing too well. My goal was that

I usually allocate up to 20 minutes for that problem during the interview, maybe extending this to 30 minutes if they are not doing too well. My goal was that the co-workers solve it under 10 minutes -- that 3x length factor is trying to compensate for harsher interview conditions. As for leetcodes -- I just looked at the site, and my interview question would be rated 'easy'. In fact, I'd say that most of the 'easy' questions there are too hard for the programming interview.