As a feasible method for cutting many thousands of huge stone blocks, color me sceptical. In fact, there's no way.
I think you missed something there lilthor. 3 centimeters deep by 19 centimeters long would be 1.18 inches and 37.4 inches respectively. 7.5 MILLImeters is 0.29 inches. So their tools aren't claimed to have degraded twice as fast.