As I have noted on the , it is important to understand that a Golden-Cross requires some serious momentum to push the 50-day up through the 200-day . This causes the instrument to (usually) become over-bought before the event actually happens. I like to use the (14) to measure this. As you can see the has already hit 75.65 on Jan 3rd and has pulled back to 63.43 as of today (Jan 15th). It is therefor crucial to be prudent in selecting your entry / add price(s) in order to maximize any profits.
There is no guarantee that a golden-cross will cause a stock price to go up nor is there any way to determine how long any benefits will remain. Past occurrences are a great tool to use in my opinion, and as so, are the reason I have included them on the chart.