Exercises for leg lengthening that works?

Can anyone advise good exercises for leg lengthening, if I want to lengthen legs about 4-5cm? How long time it will take me to get the results?

Well, you could do the african method of attaching tight rings to yourself to stretch you. You could also strap your waist down some how and strap some weights to your legs. There isn't really an exercise for such a thing as exercise simply increases muscle mass and burns off fat.