Hi Sally-Ann
There are a couple of fields Time to complete (since start date) and Time to complete (since enrol date)
These measure the total time that the user took to complete the course including any inactive time.
I think that the value is showing as 56 years as the user does not have a date started or date enrolled - maybe the have been marked as RPL without opening the course or they have unenrolled from the course. You should be able to confirm that by adding the date started or enrolment date to the report.
Regards