How to Calculate Duration from Date Columns

Hello,
I would like to calculate duration from date columns. Using the following query
SELECT DISTINCT
EVENT_ID,
To_Char(RU.START_TIME, 'HH24:MI') START_TIME,
To_Char(RU.END_TIME, 'HH24:MI') END_TIME
FROM ROOM_USAGE RU
What I need is to subtract START_TIME from END_TIME and result should be in minutes.
Many Thanks,

But, i think you need to calculate the number of days if the days are not same -
satyaki>
satyaki>
satyaki>
satyaki>with ru
2 as
3 (
4 select '05-JAN-2007 15:10:20' start_time, '07-JAN-2007 19:20:20' end_time from dual
5 union all
6 select '08-JAN-2007 05:10:20' start_time, '07-JAN-2007 07:07:20' end_time from dual
7 )
8 select ru.start_time, ru.end_time, SUBSTR(numtodsinterval(to_date(RU.END_TIME,'DD-MON-YYYY HH24:MI:SS')-to_date(RU.START_TIME,'DD-MON-YYYY HH24:MI:SS'), 'DAY'), 12, 8) duration
9 from ru;
START_TIME END_TIME DURATION
05-JAN-2007 15:10:20 07-JAN-2007 19:20:20 04:09:59
08-JAN-2007 05:10:20 07-JAN-2007 07:07:20 22:03:00
satyaki>
Or, Am i missing anything?
Regards.
Satyaki De.
is it possible to to add the duration? making the total hours to 26:12 (twentysix hours and twelve minutes)

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