I was called by two senior engineers in which each interview lasted 2 hours long. They each wanted to know my accomplishments and achievements and wanted to know more about daily activities and habits. This tells me that they care more about how passionate or driven you are, rather than focusing only on your ability to deal with elemental school problems. It was a great conversation, but I had to ensure to engage with them since they would only ask me questions and after my response, they would continue with the next question.