Given a file consisting of lines like this:
2017-02-01T20:00 OperationA Start
2017-02-01T20:01 OperationA End
2017-02-01T20:08 OperationB Start
2017-02-01T20:09 OperationC Start
2017-02-01T20:10 OperationB End
2017-02-01T20:12 OperationC End
Produce an average runtime of all operations.
Example output:
Average: 0 days 0 hours 2 minutes (0 days 0 hours 6 minutes total for 3 operations)