I had 8 Interviews over 2 months with HR, Principal, Operations Mgr and R&D all of sister companies. Did a telephone interview and in person interview in NY with MD of hiring company MinASolve then another 3 interviews in Memphis. Was told each time by recruiter each should last about an hour so plan accordingly. Most interviews lasted up to and over 2 hours. Typical questions were asked and nothing out of the norm.