LinkedIn Software Developer interview questions

I had a phone round where I was asked a few Java concepts followed by three coding exercises. The call lasted for an hour and the interviewer was nice to speak to. I later had an onsite interview with 6 rounds, of which 3 were system design and 2 coding questions. The process is exhausting as it takes 7 hours at a stretch including the lunch round. Most of the engineers were nice to speak to except for a couple of them. One Senior Engineer who asked me a system design question had a set answer in his mind and wanted me to come to that which I found annoying even though my approach was as good as his which he eventually agreed to. One of the coding round was with a junior engineer and he lacked experience which was clearly visible because he wasn't able to follow my code and also his instructions were contrasting from the beginning of the interview to the one at the end.