Create a rolling 60 minute window to assess busiest time period

Hi there,
I have a dataset whereby I am trying to determine the busiest 'rolling' 60 minute periods. I can create this by clock hour, or 15, 30 minute periods etc, but I can't find how to achieve it for rolling periods. I know it is easy to do when the period is a standard 'thing' like day, or even hour, but my dataset is down to minute level.
Please see my data sample attached. I have entries that could vary by a minute, not just every 5 min as shown.Rolling60minsample.xlsx