GSI Technology interview questions

2 days after applying, I got a phone call from the recruiter and we talked for about 10-15 minutes. A few days after that call I had a 30 minutes video call with the hiring manager. He didn't ask any technical questions, only gave an overview of the company, some details of what the department he's a part of does, and what the roll of his team in that department is. 2 days after that video call I got another phone call from the recruiter who told me they wanted to proceed and invited me for a face-to-face interview at the office. That interview took place 1 week after the video-call. The interview started with the hiring manager presenting the board that contains their SoC and engineers use for testing in their work. Then he asked me to describe the system I was working on, give an example of an assignment I had which I really enjoyed doing and describe an interesting bug I dealt with. Then he asked 2 technical questions, each with 2 parts (see questions below). At this point the interview took a weird turn. During the 2nd part of the 2nd question, while I was working on a solution, the interviewer said he needed to step outside for a few minutes, and disappeared for about 30 minutes. All that time I was waiting for him in the conference room. At a certain point I decided to go look for him around the office, but couldn't find him anywhere, so I returned to the conference room, took a look at the clock on my phone (which until that point was tucked in my bag) and saw that we're already half an hour past the time the interview should have ended by. The interviewer came back a few minutes after that and continued the interview as normal, returning to that last technical question, then continuing with some more questions about me. At the end, an interview that was scheduled for 1.5 hours, took 2 hours and 50 minutes. The response with their decision after this interview came 2.5 weeks after the interview (not that I any intensions of proceeding after that facade). There's a proper, respectful way to treat candidates, and this, was not it.