Any money for trading should preferably be unlimited, that is, without pressure and cost. If there is a limit, it is best to have a long enough time to turn around. This is a very critical point in investment. The only possibility for a limited-term money is to reduce the level of operation to a low enough level, so that the risk of this limit can be controlled as much as possible, but this is only a last resort, and it is best not to appear.