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Yes but the law of diminishing returns is especially prevalent, here.

For a serious, scientific, by-the-numbers mixing technician, the amount of quality increase versus the amount of time spent more often than not hits a massive bell curve fairly early on - particularly if it is not that technician’s original material.

Pro mixers generally finish in a day or maybe two, which is why producers choose them.

Pro mixers also have lots of presets and tool chains already setup that they always go-to. It's not that they could just finish a mix in a day, it's that they have a lot of their tooling already roughly setup, and they just have to dial it in. It still takes time to create and setup those chains/presets.

I've heard the same rule with film editing. The editing is never done, you just run out of time.