Midwestern-Interviews conducted Mon-Fri. When you receive an interview, you log into their server and they give you a choice as to what day you want.
Louisville- Interviews conducted Mon-Fri...they will give you a day, but will allow you to reschedule.
Indiana- When you get an interview, they give you a list of dates available and you rank them for preference. Interviews are either conducted Mon-Thursday, or Fri and Sat interview (You have to show up friday and saturday...friday is the tour and financial info presentation and all that, saturday is your actual interview where they give you a time and you just show up for that time, as opposed to waiting around all day)
OSU-They only have three interview dates where they do all of their interviews. They are always on saturday's whenever there isn't a football game, and if you cannot interview the day they send you, you are not able to reschedule and give up your opportunity there.
Those are the only schools I know of. It is my opinion that if you receive an interview, expect to be there all day. Also, you may have to take off more than one day that week, depending on location/travel time. Just be honest with your work, and tell them that these interviews may come up suddenly (as little as 1 weeks notice) and you will HAVE to go. Hopefully they understand. Good luck!