It depends on what coin you choose and how good you analyze the coin movements. As long as you can pick the right coin and you have the skill to enter and leave the market, then I am sure you can make 10% a week and even more. Right now, you need to be careful when you want to choose the coin because you don't want to wait too long to see the coin price can increase. But perhaps, you can use bitcoin only than the altcoin because, with bitcoin, the differences of the price can help you to gain a profit, but of course, when the price is down, you will see it drops too deep.