How to increase Maximum Execution Time for WordPress site

You may receive a message such as “Maximum execution time of 30 seconds exceeded” or “Maximum execution time of 60 seconds exceeded”. This means that it is taking to longer for a process to complete and it is timing out. There are a number of ways to fix this error.

Method 1: Edit file  wp-config.php:

Add the following to wp-config.php:

set_time_limit(300);

 

Method 2: Edit file .htaccess:

Make sure you back up .htaccess before you edit it. 

Add the following to .htaccess:

php_value max_execution_time 300

 

Method 3: Editing php.ini

Add the following to php.ini:

max_execution_time = 300

 

See more: http://codex.wordpress.org/Common_WordPress_Errors#Maximum_execution_time_exceeded