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If your maps look like in the image above, you can optimize by baking with different resolutions.
Bake areas with small details with a high amount of samples.
Bake the rest with a lower amount of samples.
Combine in photoshop.
Could you post some more numbers (lightmap size, bake-settings) so we can better understand why it takes 25 minutes to bake?
Maybe there's more room for optimization without loss of visual quality.
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