When you have a large sum to invest in, you have been told, it is best to systematically transfer it using what is called the Systematic Transfer plan (STP). This does exactly what an SIP does, except that the money to be invested, in this case, does not lie in your savings bank account. It lies in a fund. Also, unlike a SIP, where you typically invest from your monthly savings, in STP you simply deploy the lumpsum that you already hold. So far, so good. But for how long should you run this STP? Which funds do you go for? And should you always use an STP when you have a lumpsum?