I was told by a Google HR that on average a candidate tries 4 times before passing the interview. That's believable because when any of the 5 interviewers saying "probably not" translates to a no hire, stars really need to align even for stellar candidates.
I believe it's 3 times per level or role. One could interview 3 times for l5 SWE role and thrice more for l6 when they are deemed eligible again.(With more experience etc.)
