How much forward testing would you require before trusting an EA?

Nobody has ever had a bad backtest. How much forward testing is required before you would trust an EA?

I have a method that I believe was derived from very sound statistical principles but no-one believes backtests (perhaps rightfully so). How much forward testing to establish credibility?

Thanks!
Kudu:
How much forward testing to establish credibility?

That depends on the strategy being tested, e.g., how often it trades, which timeframe/custom chart structure, time filters, etc. For scalping say, 700 to 900 trades every 6 months, I would go at least 6 months.

Kudu:
Nobody has ever had a bad backtest. How much forward testing is required before you would trust an EA?

I have a method that I believe was derived from very sound statistical principles but no-one believes backtests (perhaps rightfully so). How much forward testing to establish credibility?

Thanks!

Well no one should believe back-tests ,The problem is they want to believe that leads people up the garden path either their own test on their own EA  or some charlatan with the 300 percent return in a month Time Bomb 3000 . 

There is one born every minute the old P.T Barnum proclaimed . Greed and impatience can not be afforded in this game but human nature abounds .

The trick is to lessen the blows of the lesson with micro lots , mere pennies and you have all the road to test live in action but no EA can be the be all and end all that is the mistake , they only work in set conditions .

So you should muster your best and fire when each condition looks like it presented itself , but I am reporting from the front ,it is all in vain long term ,It is a trap, a grand devilish design . 

Death by a thousand cuts with commission and the like , nobody here gets out alive ! . You only get small victories akin to roulette , negative expected value , the longer you play the more it  blows up in your face .