It also depends on the lot that you are using. If you're using a lower lot, you can use higher leverage as its not that much capital. However, if you're using high lot, its wise to use only up to 500 cause too much can be high risk. The market can be really unpredictable at times even in long term trading. In long term trading, the market can slide downhill so quickly and you have to wait like days before it will go back up to where you bought it. So, since its so unpredictably, you would offset the risk with just low or modest amount of capital.