PHP by default places resource limits on all php scripts using 3 directives:

• max_execution_time : Maximum execution time of each script, in seconds (default 30 sec)
• max_input_time : Maximum amount of time each script may spend parsing request data (60 )
• memory_limit : Maximum amount of memory a script may consume (default 8MB)

A php script might timed out because of resource limits. All you need to do is setup a new resource limits so that script will get executed.

Edit Php.ini file /etc/php.ini (or /usr/lib/php.ini) file and adjust the resource limits:

max_execution_time = 600
max_input_time = 120
memory_limit = 64M

Then restart Apache web server :
/sbin/services httpd restart

NOTE:
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