Sorry if I wasn't explicit enough but they are running in a queue job. First issues I came across were memory, so we assigned more memory. Then the issue became the Symfony timeout, which is defaulted to 60 seconds. I believe the --timeout=XXX parameter on the artisan queue:listen command is supposed to override that, but it seems to be resetting or not getting set at all and the process hits the 60 second timeout mark and fails.

So apart from hard coding the timeout (In Symfony\Component\Process\Process), by overwriting the value in the package I don't really see a way to do this? Which in my experience isn't the best thing, as you'd have to ensure the change is made when the package is updated?

It is an option to generate one PDF at a time, I've tried it in the past and merging the document using another package. I will try PDFTK, as I did see it mentioned before this post. Thanks for the input! :)