If this is CyberPanel + OpenLiteSpeed server, you can update the maxexecutiontime value from CyberPanel > PHP > Edit PHP Configs. If you only want to set the value per domain, then you can set it via web admin or vhost config with e.g.

phpIniOverride {
php_value max_execution_time '600'
}

For CyberPanel + LSWS, then you can just set php_value max_execution_time '600' to the .htaccess file.

Remember to restart the PHP process to reload the new value.

killall lsphp