I want to know when to sell TITAN on NSE?

Are you for long term or for short term? if you had picked stocks like SBI, JUBILEE FOOD etc you could have minted money in this upswing and why do you want to concentrate only on one stock. In stock trading, you should always pick the momentum stocks and make good profit in short term and also try to come out at every profit without waiting for more and more profits. As patience will give you good profits in stock market, greediness will wipe out your total profits at once. So, you should be careful here while trading in stock market as profits and loss do come faster than you expect but you need to have control on your trade