In the forex market there is no limit, only some cost but I do not want to open it more than two or three days. And if you also trade with natural gas, corn, etc., I suggest you to look at the specifications as some are done someday .. I see absolutely no obstacles so that at any time we all allow our own open deal. presented now we have a solid border to keep certain floating. but I think that this is not a useful trading technique, the truth is we are in a position to approach our own agreement if at all the benefits together with open deal again to get more benefits ...