Error message trying to view long term results

I am getting an error when I try to view Goals for a month’s period. The error is:

“Fatal error: Maximum execution time of 30 seconds exceeded in C:\WEB\Piwik\libs\Zend\Db\Statement\Pdo.php on line 228”

Is 30 seconds excessive for this type of operation? Should I just increase the max execution time? Is there anyway to speed up this operation under Windows with a MySQL db?

Thanks in advance.

you can set your time limit to 0 (unlimited) in your php.ini