I suppose in theory 15 days stops there being a proper / normal race meeting on it 2 weeks before and makes sure it's 3 weeks (As most people work mon-fri and aren't likely to practise on the Friday (16 days before)?? It sort of makes sense but i know what you mean, may as well make it 21 days or something if that's what they want to stop???
Thing is - with Astro tracks, 2 weeks, 3 weeks or even 8 weeks before unless the weather is seriously different, i can't see how either is any more advantage than the other - if the Layout & Features are the same, that's what you want to practise on no matter how close to the national it is.
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