What value is being recorded to the BackupTime column in the LiteSpeedActivity. If you do a datediff between the StartTime and FinishTime in the same table the values do not correspond. Is this not recording the time it takes to complete the backup?
Incorrect understanding on the value being entered into the BackupTime column in the LiteSpeedActivity table.
The BackupTime column is recording the CPU Time in seconds only and therefore the reason you will see a difference if you perform the calculation on the Start and Finish times in the same table.