To increase max_execution_time on the staging site, you may try these methods:
1. Edit file wp-config.php
Add the following to wp-config.php:
set_time_limit(300);
Add the following to wp-config.php:
set_time_limit(300);
2. Create .user.ini
Add the following to .user.ini:
max_execution_time = 300
max_execution_time = 300
You can use the SFTP details of the staging site and connect using FileZilla to do this.