actually depends how you wear your shoes/playing style/how often u play etc? i have a habit of 'dragging' the back foot, and as i am a right handed player, my left shoe always seems to wear out within a year. hence i usually end up with a few decent looking right shoes. and if u wear thicker socks, or use another insoles, the original 'power cushion' insole should last a bit longer too. my power insoles lasted not long after about 6 months. because i tend to jump smash a lot and puts pressure/wears it out quicker.