Add time spend per account

I would like to see total time spend per account logged in the backup logs.

Let's say I'm backing up 200 accounts, and it takes in total 10 hours, I would like to get a quick overview of why it takes 10 hours - despite the small amount of data.

I can look at the timestamps in the log file, and calculate it, but it would be cool after every account has been performed, that it said something like: "Total time for account: X minutes"