I had 2 phone interviews, one with the HR recruiter and then another with the hiring manager, and then flew in for an on-site interview. The on-site interview lasted a whole day (approximately 9:30am-5pm) and included 5 sessions with multiple people from different groups (who would be my managers/piers/employees) as well as sessions for listening to or watching recordings of meetings & sessions held at the company to get a better feel of the culture which is the most important thing at Bridgewater. I also had to complete a couple of personality tests prior to flying in for the on-site interview.