It's important to remember that the escalation to war would not happen in an instant or in a vacuum. The oft-quoted month-long REFORGER is from a standing start, with troops having to be recalled from leave and equipped while war begins in Europe. In the real 1980s, everyone know that both GSFG and the NATO forces, NORTHAG and CENTAG, would need pre-war reinforcement to accomplish their objectives, so a period of at least two weeks would likely be available for preparations before war. REFORGER could only provide significant ground forces after about 1984, when conventional parity was achieved. With a measure of pre-deployment time taken for preparations, you might see battalion groups in the field after three days, brigade groups after one week, and division groups after two weeks. Because there is already a large command structure available in Europe, combat units could be thrown into the line without having to wait for higher headquarters units. Non-REFORGER units in CONUS would have to draw equipment and ship it to seaports, so those formations would probably take a full month to get into action.