Greetings, I'm in the artillery business and an FO for the past 18 years. Today, in training, I can get adjustment rounds from Call For Fire (voice) to impact inside 90 seconds depending on the battery experience, FDC training etc. Using 4 adjustment rounds (successive bracketing...slow) I could go from CFF to FFE in 5 minutes. Using one round adjust or a hasty bracket it would likely be inside 3 minutes and could be closer to 2. Even with WWII comm I am confident that in a combat situation things might go a lot faster than normal. You could see a FFE inside 5 minutes with little adjustment, possibly 3 minutes. I think CM does an outstanding job of modeling arty and the FO's. Of course I might be slightly biased. : )
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When the situation is obscure....attack!
CGen. Heinz Guderian