Problem with datetime

Hi,
I have a table on pGSQL 6.5.2 wich contains several accounting data
from radiusd in the following form:

bwin                int8
bwout               int8
name                varchar()
start               datetime
stop                datetime
callerid            varchar()
fr_protocol         int4
fr_addr             inet
data_rate           int4
disconn_cause       int4

I'm now trying to get summaries of the data in several time intervals
eg:

SELECT sum(stop-start) FROM logs WHERE name = 'intern-mw' andstart >= '28-10-1999' AND stop < ('28-10-1999'::datetime +
'1day'::timespan);
 
sum                      
-------------------------
@ 2 hours 57 mins 56 secs
(1 row)

Thats ok

The same for the 10-27-1999:

SELECT sum(stop-start) FROM logs WHERE name = 'intern-mw' andstart >= '27-10-1999' AND stop < ('27-10-1999'::datetime +
'1day'::timespan);
 
sum                      
-------------------------
@ 4 hours 37 mins 20 secs
(1 row)

I think, thats also ok.

But now both days at on time:

SELECT sum(stop-start) FROM logs WHERE name = 'intern-mw' andstart >= '27-10-1999' AND stop < ('28-10-1999'::datetime +
'1day'::timespan);
 
sum                      
-------------------------
@ 12 hours 51 mins 4 secs
(1 row)
uups what's happening here ?

I've doublechecked the WHERE clause, It is ok, the right tuples are selected,
but 3h + 4.5h are not 13h! Wat I'm doing wrong here ?

It is possible to get the timespan in minutes only ? I mean the entire timespan
in minutes not the minutepart of the timespan.

Thanks,

Holm

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