I marked the part in red in the screenshots. It is now unclear that the time is meant to tell the user when it was in reference to the current time and date. In an outline overview of a user in a course, it's easy to falsely assume that it is time spent by the user in that course (especially when it says several minutes or hours).
-simply add "ago" behind it
-remove it, it's not very valuable information in this context I believe