Post script timeout in backburner

Hi all!

I have a post-script that launch Photoshop and make it run a droplet on the rendered file. Then when PS is done I use 7-zip to zip the rendered file. Finally it removes the rendered file and closes PS. It all works fine on lowres renders but as soon as I increase the rendersize and PS takes longer to do its task the script never finish.
So my question is: Is there a timeout on post-scripts when using Backburner? When I run the script locally it works but as soon as I use it with Backburner it doesn't work.

Any thoughts would be much appreciated.

Have a great day!