that being said, everybody talks about like leetcode tests for a week straight is the norm. I've recently been through the whole thing with several big tech companies and some smaller companies, and all of them only used them for the phone screen.
in fact with microsoft for various reasons they skipped my phone screen and I went straight to onsite, and there was no leetcoding involved at all. still some whiteboard coding, but rather about highly specialized problems relevant to my field, none of this algorithm puzzle bullshit.