Hello,
The following error:
PHP Fatal error: Maximum execution time of 30 seconds exceeded
is a PHP error that appears when a script exceeds the maximum time allowed in PHP.
On the following pages, you can read more information about this PHP question:
https://www.php.net/manual/en/function.set-time-limit.php
As explained in our previous reply, you may need to increase the available memory for PHP or the maximum time a PHP script can run on the PHP settings of the server you are using.
Please note that Dompdf requires significant memory and time to generate a big PDF. Other conversion plugins such as the one based on LibreOffice are faster. On https://www.phpdocx.com/documentation/conversion-plugin are detailed the available conversion plugins and how to configure and use them.
Regards.