The night spread is very different between demo and real on most brokers.A lot different. Also slippage could kill you strategy. Moreover it depends if you trade during volatility times or not and how short your timeframe is. On operations opened for a day or more and if you are not trading during news you would have pretty much the same result but if you trade on 5 minutes chart I would consider a reduction of at least 0.3 on your profit factor.
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