correction:

> The result I'm expecting for the above to be
>
>    notification_time    |     finished_time      |     actual
> ------------------------+------------------------+-----------------
>  2007-07-06 15:50:00+10 | 2007-07-09 07:10:00+10 | 01:20:00
>  2007-07-07 12:30:00+10 | 2007-07-09 07:20:00+10 | 00:20:00

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