Tomo_Ishi,

Also, to finally answer the question you actually asked my SPD cleats seem to last a good, long time. 1 year at least. But, I've only been riding fixed for something like 3 months and I swap out to SPD's on weekends/holidays. During the week when I commute I do so on flats. I lose a bit in the connected feel department but it's a fair trade off for me as my commute is pretty flat.