Don't think of something impossible or hard to achieve. It's better to set more modest goals that you'll be able to accomplish than something that will end up failing you. With the ability to double your funds in such a short time, you are likely to take too much risk to lose. Bitcoin isn't the weapon to get rich over night, no matter how tempting it is.
It is not that bad to dream.
I mean setting a goal is not bad. If it is hard to achieve, then work hard, the better you become, the better your profit can go. With this market, the price is really fast changing, and doubling your capital is not impossible but you should not hope that much since no one knows what might happen.