Fatal error: Maximum execution time of 240 seconds in /vendor/phpoffice/phpspreadsheet/src/phpspreadsheet/Reader/xlsx.php

Hi I am getting this error “Fatal error: Maximum execution time of 240 seconds in /vendor/phpoffice/phpspreadsheet/src/phpspreadsheet/Reader/xlsx.php”.

You should probably increase the execution time in this case. Here is a tutorial on how to do it:
https://www.simplified.guide/php/increase-max-execution-time

Hi,

I checked it in pimcore admin panel php info its showing local value = 240 and master value = 300. What is the difference between these two and how can i set it for new value? I am using Pimcore Version 6.5 and php version 7.2.27.

The master value is usually given for the whole webserver, the local value is the one for the specific website. There are several methods to increase the execution time given in the link I posted before - that depends on your webserver or webhosting company.
This is no pimcore specific issue but a general hosting issue.