start time and end time for a query is same which takes 25 seconds to get execute.

In a file called query.sql, i have kept a query which takes around 25 to 90 sec's to get complete. Before and after the query i have kept select now();
But I am getting same time(result) for both the select now().

Ex:
select now();

select statement which runs for 25 -90 sec's

Select now();


Output
---------
Timing is on.             
c1
-------------------------------
 2014-06-09 08:58:25.449612-04
(1 row)

Time: First fetch (1 row): 16.637 ms. All rows formatted: 16.680 ms

 GENDER_CODE | GENDER  |  C548   |       C549       |   C65   |        C3
-------------+---------+---------+------------------+---------+------------------
 02          | MALE    |  948583 | 19820794210.3239 |  948583 | 18753529074.2442
 03          | UNKNOWN |  699106 | 13843051800.4582 |  699106 | 13102890661.4551
 01          | FEMALE  | 2579452 | 54830989697.9887 | 2579452 | 51887346055.0932
(3 rows)

Time: First fetch (3 rows): 90961.453 ms. All rows formatted: 90961.521 ms
              c2
-------------------------------
 2014-06-09 08:58:25.449612-04
(1 row)

Any idea why it is so?

Regards
--Noor