How long,approximately,do geologists estimate it takes for the entire seafloor to be replaced due to plate tectonics?

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Geologists estimate that it takes about 200 million years for the entire seafloor to be replaced due to plate tectonics. This is known as the "Seafloor Spreading Hypothesis" proposed by Harry Hess in the 1960s. This hypothesis states that new crust is formed at mid-ocean ridges and then spreads outward, eventually being destroyed at subduction zones. Over time, this process leads to the replacement of the entire seafloor.

How Long,approximately,do Geologists Estimate It Takes for the Entire Seafloor