This is definitely a "sheets" rule of thumb... according to Thoro and Ragozin, 4 to 6 weeks is optimum rest from an "effort" (how to define an effort, another question)... This is not to say horses don't win on short rest, it's just not the best amount of time for recovery. Older/cheaper horses may only have so many good races in them, that might be why they are wheeled back quickly. Of course this rule was made before the "Super" trainers came into prominence.
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