The US was known for incredibly rapid, widespread, and accurate use of artillery in WW2. The Soviets might have taken a half hour to line up artillery after it's been requested for defensive support fire (to their credit, the Eastern Front was vastly larger than the Western, and they had less industrial capacity than the US), and the Germans maybe 15 minutes. Because of extensive planning work and the most incredible feats of logistics work in history, the US could do it in 2 minutes, sometimes as low as 30 seconds.