Long-duration funds have enjoyed a solid run for over a year. With the 10-year bond yield crashing below 6%, these funds have comfortably delivered in excess of 10% return — bond yields and prices move in opposite directions. Even medium- and short-duration funds have latched on, not trailing far behind on the performance charts. Now, however, the time may have come to finetune the duration strategy.Bonds initially soared as interest rates came