How do I look at each student's individual sessions for the amount of time spent?
Welcome to the Canvas Community!
There is information related to Activity in the People tab for each student. You can also look at the New Analytics to find additional information.
How do I use the People page in a course as an instructor?
How do I view the course access report for an individual user?
How do I view a summary of all my student interactions in a course?
How do I view analytics for an individual student in New Analytics?
In addition to the Guides that Robbie Grant Admin provided, please keep in mind that times displayed may not be completely accurate. It's entirely possible that a student may log in to Canvas, do some work, leave their computer for a time, and then come back to resume work...all while still being logged in to Canvas.
Retrieving data ...