Hello,
You mentioned both an import (category) and an export (items). The Manage Timeout is only applicable to imports because exports usually continue to run. So let's focus on 1 issue first, the export. The import issue is better dealt with in a topic of it's own. Since you are not an a VPS or Dedicated server, the hosting company most likely won't allow you to override these limits. If your server doesn't run the export via the browser, the only other option left is the command line because this should not have any limits. The command line can be done either via SSH or running the export as a cronjob.
Since SSH is usually a step too far, let's look at the cronjob. We have explained in the
Setting up a cron-job document on how to do that. If you have CSVI write the export file to a place on your server you can download it from there after the job has finished.
Let us know how things go.
Kind regards,
RolandD
=========================
If you use our extensions, please post a rating and a review at the
Joomla! Extension Directory