The problem was that baking the texture was really slow. When I googled the problem, most answers suggested that to make it faster you should make the texture you want to bake to smaller, such as 512 and not the 2048 which is what I wanted. But the one with the answer was no-one else than our dear friend Blender Guru and his video: 18 Ways to Speed Up Blender Cycles Rendering. The one "way" that improved baking was "#3 Use GPU." Apparently, most likely because not everyone has a GPU compatible with Blender, Blender is not using the GPU by default when generating images but the CPU which is slower. To tell Blender to use the GPU, you click File → User Preferences → System. And then at bottom left, you should select CUDA:
But that's not it! You also have to set the render to GPU Compute (CPU is default) in the panel to the right:
The results:
- GPU: 2 minutes 33 seconds
- CPU: 9 minutes 42 seconds
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