A good way to finish mixes faster, no matter how often or rarely you get stuck with a mix, is by limiting yourself.

It should be obvious that every mix you do won't necessarily turn out as good as the prior or as bad as the next. Mixing and music is diverse and complex, and the outcome will always be different.

That's why following a process and applying certain techniques are good ways to make your work more efficient and consistent.

By taking mixing too personally, or treating every mix like it's your one big masterpiece,  it will likely end with frustration and disappointment.