There have been times in the recent past where I saw a stock in my portfolio shoot up and then within a few days go negative. I want to start using stop losses on stocks in order to protect profits. I know, you are all saying, why is this idiot not using stops always. Well, I used to always use them and get stopped out once I hit a specific percentage. Then, the stock bounces back either later in the day or in a couple of days. The question is how much room do I give in order to protect myself from just a stock shake-up?