There were three interviews. One over the phone (30ish minutes), two face to face (2h each) The face to face ones included 3 powerpoint presentations and a lot of prep. They ask for a lot for a startup, interview-style is similar to the Big 5 style of interviews. For the money they pay, I think its too much. Also asking questions about things that have nothing to do with the role you apply for. Otherwise its good practice and you will learn a lot about what you will be expected to do.