Quote from TRADERguy:
Sounds like too much. I use less than half that while day trading and even less for overnight trades; and there are many that would consider the leverage I use to be insanely high. Calculate the percentage of your account that you are risking for each trade. It gives you a better idea of what you are risking and and what kind of devastation you could do to your account with a string of losses or one news shock that gaps against you. One thing I've found helpful when trading with a bit of leverage is to have a maximum percentage of my account that I allow myself to lose in a day (you could do this on a weekly or monthly basis for longer term trades). If I reach this max drawdown I stop trading. This protects myself from occasional bouts of self destructive stupidity.
Lynx: 10:1 is MAX if you want to last more than a month

