Quote from Pekelo:
Ok, so you want 10 or more days, I got it.
I am not sure why they are limiting it to 10 days, since the period is still a month. As I guessed earlier, they might want the traders to take just the best opportunities, thus if a day doesn't look like a good one, the trader should not trade at all. A little bit strange approach, because it looks like they are looking at daily averages, but they judge at the end of the month, when a monthly average would apply...
Well, that's there rules, we just have to optimize the approach to have the most advantage. For example starting in December isn't a good idea, because of the holiday season. Volatility should dry up going into the end of the year....