When will you get Gains on HDFC Bank? In how many days?

I can see that HDFC Bank has touch this level so many times and it had gained a lot around 10%-15% in 30 to 40 days as I have drawn in the chart.

From this point I have clear vision of making around 20% gain.

It may show good upward move as the Nifty and Sensex stabilize.