What is the best unit of measure for the time portion of a non-earth-bound light"year"?

The question, Reference to Earth in Intergalactic Universe illuminates the shortcomings of the term "light-year", which defines a distance by mixing the universally constant speed of light in a vacuum with our far less universally recognizable measure of time known as a "year".

What measure of time would be universally constant and automatically recognizable by all species who achieve space-travel?

Some element's half-life seems like a good starting point, but which element and which isotope of that element?

Also, what would we call the resulting measure of distance? A "Light-HalfLifeOfFrancium233" doesn't exactly roll off of the tongue.

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What is the best unit of measure for the time portion of a non-earth-bound light"year"?

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