The size of your image is definitely gonna slow it down...lol. The other stuff might be contributing as well. It's kinda of the same general rule as Poser in that area - the more stuff, the bigger the image, the longer the render ;).

If you have any trouble setting up luxrender on your other machines so that they can help with the render just let me know.

All you really need to do is install Luxrender on the machines you want to network. Go into the Luxrender folder and make a shortcut of luxconsole.exe and place the shortcut on your desktop or somewhere you can get at it easily. Right click on the shortcut and choose properties. In the Target line, put this:

C:LuxrenderLuxRender_32_SSE2_NoOpenCLluxconsole.exe -s

and save that. Then, when you double click the luxconsole shortcut, the panel will open and that machine is ready for a command from your main machine.

You'll only need the IP of that networked machine now and when you open your render in Luxrender, go to the network tab and put that IP in the field and hit the plus sign. Depending on how many textures are in your scene, it may take awhile to send them all over to the other machine, but in a few minutes it should be starting to send you some samples ;).

Laurie