I have taken these steps but it just wont change for the indoors PC.
My settings are these but the preview estimated time never changes no matter what changes I make to the decision. I know tis design was going to take 5 hours (this is what my workshop POC reported and it was correct when I ran the project).
Is it because I have never attached the laser to this indoor PC?
It has nothing to do with that, no. The only things that control the time estimate in the preview are the settings on the ‘Additional’ tab in the device settings, and the actual settings for the layers.
You say “the preview time never changes” - what do you mean by, “never”? You have your lines set to travel 100mm/sec, but the machine is limited to 16.6mm/sec, so changing the speed in your layers to anything higher than 16.6 will have no effect on the end result. If you delete or add shapes, it should change the output time.