The term cycle was an unspecified unit of time used by different species.

When Thylek Shran posed as a member of the Andorian Mining Consortium in 2153, searching for archerite, he told Degra that what he sought was extremely valuable to the Andorians, and that "[e]ven a few kilos will pay our expenses for the next ten cycles." (ENT: "Proving Ground")

The Borg measured their maturation and regeneration cycles by individual units. According to Seven of Nine, assimilated children were placed in the chamber for a period of seventeen cycles. (VOY: "Mortal Coil") Later, when Seven of Nine discussed Icheb's regenerative needs to Leucon, she explained that she adapted a neural transceiver to interface with a portable regenerator, and figured the device had enough power to complete one full cycle for Icheb. Though the length of a cycle was not specified, she did add that "[i]t's important that Icheb regenerate for six uninterrupted hours" per day. (VOY: "Child's Play")

The Romulan officer Decius, aboard the Praetor's flagship, noted in 2266 that they had no motion on their sensors for twenty cycles. James T. Kirk had also noted in a log that the USS Enterprise had been motionless for nine hours and 47 minutes. (TOS: "Balance of Terror")

In the background chatter of TNG: "Unification II", it is possible to hear dialogue noting something about "two cycles". The exact line is "We are very close now... within two more cycles."

The Argrathi cycle was equivalent to one Earth year. The crime of espionage required a minimum of fifteen cycles of correction on Argratha, and Miles O'Brien served twenty cycles, the equivalent of twenty Earth years (though his entire imprisonment was actually an artificial memory). (DS9: "Hard Time")

See also

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