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Level 5

Natalie,

I would expect that (Page Views - Exits) would be closer to the sum of the individuals rows of the time spent dimensions.

Time calculations within Adobe Analytics are (time of most recent event - [minus] time of prior event). 

If a user loads a page and then exits the site there isn't a second event to use in the calculation and no time is recorded for that page view.


I would recommend familiarizing yourself with the 'How Time Spent is Calculated' section of the Adobe help docs.
Time Spent