I have posted yesterday about my system that if traded entire 2007, would double my account, but I have only backtested the system in 2007 and 2006, every year account doubled, my question if for how many years should I backtest it, to be sure that I have a winning system, I have no experience in how many years I should test it, are 2 enough? should I test 4 or 6 years? I don't have a clue about that I hope someone can help me here.

Thanks Mike

Thanks Mike