From my experience, and it's NOT always the case, however i have a 3 day rule. After a huge run up it typically takes 3 days to bottom and the 4th day is determined by the stock and news ALWAYS plays a factor. Everyone knows that News changes the game in either direction at ANY given TIME. Like i said, the rule is just MY own rule of thumb and it does NOT work all the time, but it sure as heck keeps me from LOSING a lot of money at times! Plus it gives me great entry points as well :-) lol