quindecennial = 473353889.63184 second (time)
Try converting from "quindecennial" to calendar yr (calendar year), century, day, fiscal yr (fiscal year), fortnight, hour, leap yr (leap year), minute, month, novennial, octennial, olympiad, pregnancy, s (second), sidereal day, sidereal yr (sidereal year), spring, synodic month, week, yr (year), or any combination of units which equate to "time" and represent time.
quindecennial = 61.1 autumn, 15.01 calendar yr (calendar year), 15.22 fiscal yr (fiscal year), 391.33 fortnight, 131,487.19 hour, 180 month, 1.67 novennial, 1.88 octennial, 3.75 olympiad, 20 pregnancy, 3 quinquennial, 473,353,889.63 s (second), 5,493.63 sidereal day, 15 sidereal yr (sidereal year), 58.94 spring, 185.52 synodic month, 782.66 week, 2,739.32 weekend, 61.53 winter, 15 yr (year).
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