I have the same issue, did you ever get this sorted?
This option is not available in ePO and the way to do it is the one you are using at the moment.
I would recommend you to request a PER (Product enhacement request) to McAfee and they will think is this option is possible ot not to be implemented in future versions.
How to submit a PER:
is there no way7 to run a custom SQL query and display it's results? The I might be able to acheive this.
As far as I know and I have checked that property is not populated in the database. I have been checking the tables and I could not find that property.
I owuldn't need it in the DB! Since I have the start and end times in my report already, i could just subtract them and plavce the result in a new column in the raw SQL query.