I was an intern for 2 summers. Hours varied, but I enjoyed work enough that I didn't care. There was even one week where I VOLUNTEERED to work 40 hours of overtime. My supervisors were professional at work, and we became friends after hours.
I met the owner my first day while waiting to take a drug test. I thought he was a customer and did not discover he was the owner of the company until he gave a state of the company address the next month.