A few years back I did a phone screen with an org that seemed interested in me; the phone screen went really well so they asked for an onsite. But they warned

A few years back I did a phone screen with an org that seemed interested in me; the phone screen went really well so they asked for an onsite. But they warned me that they wanted to take advantage of having me onsite, so the onsite would last all day. Ok, I thought, fair enough. I took a day off of my then-current job and showed up at 9 AM and spent the next 6 or so hours interviewing with various people (nobody ever thought to ask if I'd eaten lunch, which I didn't that day). The recruiter said it went well, but a few weeks later told me that there were some other people who wanted to talk to me in person. So they wanted another all-day on site. At that point, I figured I had already sunk so much time into this interview that I might as well go ahead and do it and - surely! - they wouldn't invite me back for a second all-day onsite interview if they weren't nearly positive they wanted to hire me by that point. I was wrong. After another all-day onsite (this time I had the foresight to bring some snacks because, again, there was no break for lunch although I spent quite a bit of time sitting by myself waiting for interviewers to show up), I never heard back from them again.