Bri: It varies according to your trading style. For a long-term trend follower, it is 2 weekly close with a lower high and a lower low. You'll buy it on or after the 3rd week when daily price closes above the previous week's high. I have put together a long-term trend following strategy and I'm backtesting on few stocks to see if it holds true, so far the results look good. I will post those in the near future.