I was once ghosted mid interview day. They left me in conference room and completely forgot. I was going to walk out after 30 minutes but I just wanted to see h

I was once ghosted mid interview day. They left me in conference room and completely forgot. I was going to walk out after 30 minutes but I just wanted to see how long I could stay there. It took them five hours. And this was in a “highly secure” building so not sure how they invite someone to interview and let them just hangout inside the building for five hours.