well the risk depends on the amount you put in like in anything, my estimation is that within 1 month it on average moves around 10%
You are right, All of risk depend on the amount you put it. By the way, I think investment in bitcoin is not too risky. because, In a long term, bitcoin is a profitable investment. So we don't worry how much we invest in bitcoin.
Yeah bitcoin is growing like an crazy at a moment and in future when it will find many more investors it will take its price even to higher level so I don't think there is any risk of investing in bitcoins at a moment as in future it will give us some best profits on our investments.