Are Job Inspector 'duration's a total or an average across the invocations?

In the Job Inspector, each line gives a duration, a component, and a number of invocations, e.g.:

Execution costs
Duration (seconds)      Component   Invocations Input count Output count
    1.408   command.dedup   43  314,598 270,790

Are those durations a total or an average across the invocations? For example, in the report above did command.dedup take a total of 1.408 seconds in that search or did command.dedup take a total of (1.408 * 43) = 60.544 seconds in that search?

I'm asking because the numbers don't seem to make sense either way. If it's a total, then a lot of time in our search is unaccounted for. If it's an average, then it still doesn't seem to add up to the total given in the 'search completion' summary.

The indented lines appear to be a subtotal for the lines whose bar starts in the leftmost position. Even taking that into account, the duration times still don't add up.