You are asking question someone else but as I am one of the authors I think I can provide qualified answer too. His current DD is -$2,600, that represents 22.85% of the account balance. It is not great situation but it happens sometimes. To keep the DD lower one should use smaller risk. When setup reasonably one can make around 20% per month with DD not more than 15% (this is based on our testing so far, we cannot guarantee that, obviously).

You can check out our demo performance (go to our website and go to Performance page). Our GBPJPY/EURCHF demo account has DD around 25% at times but also profit is higher.

Our USDJPY/EURCHF has 100% profit from Jan 22, the max DD was not more than 10% ever. That makes 25% per month in average.

Our GBPJPY/EURCHF demo has 66% profit since Mar 17. That is approx. 33% per month in average. Its DD is quite big at the moment (23.62%) but this is due to fact that GBPJPY/EURCHF is much "wilder" combination and we set up our demo quite aggressively just to find out how much it can stand. Just imagine if we used half risk, it would make 16.5% per month (I am referring to our test period now, not in general) and current DD would be 11.81%, which is ok, I guess.

Anyway, each trading strategy means one can have some DD for certain period of time. The only thing is to keep it within acceptable range. I think we can do that.