Did Earths' rotation speed up during the great flood? Due to increased water level?

So before the great flood, 1 sidereal day should have been very different? Since with increased water, the sun and moon would have been able to increase their tug to change the rotation period of earth?
Update: AND if the flood was localized, why didn't Noah just take the animals to China or some place else?
Update 2: THE EARTH BULGES IN THE MIDDLE AND OCEAN LEVELS ARE HIGHER THERE. WITH MORE WATER, THE BULGE WOULD HAVE BEEN GREATER.
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