2 technical interview - with two engineers, 1 hour and half interview, first warmup question with valid palindrome, the second question return the miunumim in list in O(1), 3rd question - implementing LRU cachs 1 vp r&D interview - more personal 1 HR interview

Phone call with the recruiter, followed by a tech screen, interview prep with the recruiter, then 4.5 hour on-site including a 30 minute break. For the time commitment they expect from candidates, I really wish they would prepare better on their end. Every round of my interviews went over. There was no time management from the interviewers. I did not get my break. The on-site ran a full five hours for me, straight through what should have been my lunch. I had one round where the interviewer presented a problem, and it was clear there was no way I'd be able to get through the whole thing in 45 minutes. This was especially true considering the poor coding environment chosen for such a problem. I was told this was a problem where we would work together, which I guess means to put someone on mute and not pay attention while you make them try to do a couple hours of work in 45 minutes. As far as I was concerned, the interview was over at that point, but I still had more. Is there a polite way to say you're done, and excuse yourself from an interview?