Days
Both words in one sentence
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Its more like the age of steam distances where it takes three days per light year, so about twelve days to get the nearest star.
Source: Literature / Known Space - But, in the grand old days of the Republic, hundreds of servants would change thousands of light bulbs at our slightest whim!
Source: Light Bulb Joke -
Ships can cross the universe in days even though you can't travel faster than the speed of light because the speed of light was increased six hundred years ago.
Source: It Runs on Nonsensoleum
Cite this Source
Light and Days. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/days/light
Days & Light. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/days/light>.
Light or Days. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/days/light.
Google Ngram Viewer shows how "days" and "light" have occurred on timeline