Pretty unprofessional, after the phone technical HR insisted that I come in for an onsite with 36 hours notice, or the position may no longer be open. Four hour-long interviews back to back with no lunch break, ate lunch during one of the interviews while the interviewer (video from SF) was not eating lunch due to time change

Phone screen with hiring manager, then onsite final round with people from Product, Engineering and Design. It was a great experience, and every interviewer had challenging, but enjoyable questions.