So I just bought my first reel of string, and I would like this to last me as long as possible. So I am wondering what is the least amont of string I can use per job. I have a Wilson Pro Staff Tour 90 (16 x 19 pattern) and I use one piece. I usually use about 10'9 for the short side, but I am not sure what I can get away with for the rest of the racket. Any suggestions would be appreciated, thanks.