Hi megscott
Welcome to the Canvas Community. You ask a good question and one that many folks have wondered about. To start, here are a couple of pages from the online instructor's guide to help you get started:
But, thanks to Community Genius @James (not his official title, but it should be), here is Canvancements - Canvas Enhancements that he wrote called Obtaining and using Access Report data for an entire course . Once you obtain the proper browser plugins--and assuming you are comfortable looking at a spreadsheet--it is extremely easy to use and works like a charm.
HOWEVER, "how long they stayed," as you request, is not--I don't believe--one of the items generated on the report, and even if it was it should not be trusted. I could stay on a Canvas page for a long time while deciding to brew a cup of coffee or being distracted by other things open on a different browser tab. It is simply not a really, really reliable indicator of things. But if you can live without that, I think you will find James' script a wonderful way to view all other activity going on it your course site.
I hope this helps a bit, Megan!
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