millenium = 31556925975.456 second (time)
Try converting from "millennial" to autumn, calendar yr (calendar year), day, fiscal yr (fiscal year), fortnight, hour, leap yr (leap year), millenium, minute, month, novennial, pregnancy, quindecennial, quinquennial, s (second), sidereal day, sidereal yr (sidereal year), spring, summer, weekend, or any combination of units which equate to "time" and represent time.
millennial = 4,073.33 autumn, 1,000.66 calendar yr (calendar year), 10 century, 100 decade, 8,765,812.77 hour, 997.93 leap yr (leap year), 525,948,766.26 minute, 12,000 month, 125 octennial, 250 olympiad, 200 quinquennial, 31,556,925,975.46 s (second), 142.86 septennial, 13,368.21 sidereal month, 3,929.1 spring, 3,904.59 summer, 12,368.26 synodic month, 182,621.1 weekend, 4,101.92 winter, 1,000 yr (year).
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