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I was looking at Nomi no Sukune's feat and I realized something, yes, we do know the pressure at which carbon turns to diamonds, but we completely ignore the fact that diamonds take 1 to 3 billion years to form under such conditions, so I started wondering, is there a relation between the time it takes and pressure? As in, if I were to increase pressure, would the process be faster? And what's the proportion? Could we say that if I double the pressure, the time required is halved? Can anyone give me an answer with (at least some) scientific backing?