Fatal error: Maximum execution time of 30 seconds exceeded

Hi There,

I have about 60 subscribers, when I published a post, I am getting an error:

Fatal error: Maximum execution time of 30 seconds exceeded in D:\Hosting\11268478\html\wp-content\plugins\email-subscribers\classes\es-sendmail.php on line 480

In the Cron Mail section I have set the Mail count to 30, I am using easycron for the cron job and have placed the “define(‘DISABLE_WP_CRON’, true);” in wp-config.php

Am I doing this right?
How can I fix that?

Thanks