How to convert an interval like “1 day 01:30:00” into “25:30:00”?

Question

I need to add some intervals and use the result in Excel.

Since

sum(time.endtime-time.starttime)

returns the interval as \"1 da

Answer 1

Since there is not an exact solution for the topic:

=> SELECT date_part('epoch', INTERVAL '1 day 01:30:00') * INTERVAL '1 second' hours;
  hours
-----------
 25:30:00
(1 row)

Source: Documentation