Currently, the earth's rate of rotation around its own axis is 24 hours: this determines the length of a day and if the rotation would increase, the day would be shorter.
Did you know that the rate actually decreases with time? the day now is about 1 millisecond longer now than in 1900!
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<span>Ages of rocks from different Islands in the Hawaiian island chain show that the islands are progressively older to the northwest: Oahu, 3.4 to 2.2 Myr (millions of years); Molokai, 1.8 to 1.3 Myr; Maui, 1.3 to 0.8 Myr; and the Big Island (Hawaii), less than 0.7 and still growing. </span>
