Past couple of weeks, I've been using 3-4 ft of tippet on a 3ft furled leader for fishing several small streams. Never fished with a leader that short before. I have been turning over bushy size 12s with a 3wt without a problem. Catching tons of fish, too.
It all depends on the situation....if your having problems turning over or getting caught in the bushes, go shorter. If you are spooking fish or fishing a pressured stream, go longer.