I applied through a referral, and they reverted back within a couple days. Overall the entire interview process took only 2 days spanning 1 round with the Head of ML (VP), 2 technical rounds with Principal MLEs followed by 1 Culture fit round with the People Head. All of the interviewers were very friendly, accommodating and understanding. They primarily focused on my relevant past experience, with a little bit of problem solving. All of the interviews lasted 30 mins.