Time of day or day doesn't affect if you get in. I have friends who are med students at UofC who have interviewed the first day and last day, and either the morning or afternoons. Trust me, I had the same questions running in my mind about dates and times. So don't worry too much about if an interviewer has eaten or not lol. Each day has a different set of interviewers. Pick a date that works for you and your schedule.