I believe I had a total of 4 interviews from phone to virtual to the last being in their office doing a series of interviewing with many different employees. For a company to take that much time from someone I found it very unprofessional that they never contacted me to tell me I did not get the offer. I even sent a follow up and they said they were going to call me and still never did.

It was about 30 min - 1hour process and runs portfolio reviews together and answered some questions about the position, and some conversations about the company, company cultures, working schedules, etc.