I've interviewed at various "prestigious" companies widely considered to be rigorous in their interviewing, and no one has ever asked me to solve 2 leetcode hards in 45 minutes. I think I might have gotten one leetcode hard question ever. Most companies seem to ask relatively straightforward questions, although they do sometimes expect you to solve them quite quickly.
Doing a bunch of leetcode problems (something like 20-30 hours over a few weeks) certainly made it easier to answer questions quickly, largely by becoming more fluent in the language and libraries.
Doing a bunch of leetcode problems (something like 20-30 hours over a few weeks) certainly made it easier to answer questions quickly, largely by becoming more fluent in the language and libraries.