millenium = 31556925975.456 second (time)
Try converting from "millennial" to autumn, calendar yr (calendar year), century, fiscal yr (fiscal year), fortnight, hour, leap yr (leap year), minute, novennial, octennial, pregnancy, quindecennial, quinquennial, s (second), sidereal month, sidereal yr (sidereal year), summer, synodic month, week, yr (year), 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, 365,242.2 day, 100 decade, 1,014.56 fiscal yr (fiscal year), 525,948,766.26 minute, 12,000 month, 125 octennial, 66.67 quindecennial, 31,556,925,975.46 s (second), 142.86 septennial, 366,242.2 sidereal day, 13,368.21 sidereal month, 999.96 sidereal yr (sidereal year), 3,929.1 spring, 3,904.59 summer, 52,177.46 week, 182,621.1 weekend, 1,000 yr (year).
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