How to summarise time values in a Pivot table?

[vergab]

Hi there,
I try to create a Pivot table from these data:

Area	TT	Site	Work time	Month
A	INC000000177407	1687	25:08:51	2
B	INC000000183547	2771	24:24:38	3
B	INC000000132330	1075	19:31:04	3
C	INC000000231001	2709	18:31:27	5
A	INC000000254227	4079	27:04:10	7
A	INC000000255227	5707	31:48:56	7
C	INC000000259337	2732	21:58:03	7
C	INC000000276814	2709	22:55:13	8

<tbody>
</tbody><colgroup><col><col><col><col><col></colgroup>

I would like to summerise the working time values like this:
Area A - 84:01:57, and so on.
But it shows the result with the quantity of Area A (3). How should I do it?

 

[MattVizor]

Re: How to summerise time values in a Pivot table?

but then you can't change the Pivottable to a sum from within the field list?
Apologies if I am preaching to the converted, but if you click on the dropdown list next to, what I assume is called, Count of Work time, then select field value settings, are you able to select 'Sum'?