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One Earth day is equal to 23 hours, 56 minutes and 4.1 seconds (the time required to complete a single rotation of the Earth).
How Long is Today? Today is predicted to be 0.7194 ms (milliseconds) or 0.0007194 seconds longer than 24 hours. This is the time it takes Earth to rotate 33.46 cm (13.17 in), as measured at the equator. On average, a mean solar day in the last 365 days was 1.43 ms over 24 hours, so today's day length is below average. Over this period, 312 days have been longer than today, while 54 have been shorter than today. If every day was as long as today, a leap second would have to be added every 1390.05 days.