I am a prek - 4th grade elementary school. My ideal schedule would be to get into each grade level once a week for a formal walkthrough. I would do this through a rotating schedule of time chunks so I can see all the different subjects being taught by my teachers. It has been recommended to schedule times but I find the more I try to schedule the more I seem to be pulled in multiple directions as I am the only admin in my school building. I try to find spots when I find myself stalling and I then pick a classroom to complete a walkthrough. Seeing the kids often will get me back on track.