Well it depends. I set my stop to the low of the day or the day before I open the position. I generally close the position after 2 or 3 days except if it goes my way.
I usually close my positions after 3 days except if the close is close to the high of the day (if I am long). Sometimes I look at the relative strengh of the stock compare to the indexes. If the index is up 2% but the stock is breaking even then I would close the position.