For a small part like this the time to print a layer will be similar to the material switchover time /purge tower.
You have lots of layers which contain both colours, which means you need lots of material switches.
An orange cube on top of a black cube will print much faster than side by side. If you can, try more stacked switches than adjacent
Try making the box, portholes and door frames black.
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I was also selecting what I now know as a 'support filament' that has a 4x slower print time.
Lots to learn!
