Depending on the type of materials in the string, the construction of the string, the gauge of the string, the pitch, the winding design, the amount of dirt on your hands, the amount of dust and dirt in the air, the temperature, the humidity, the acidity of your hands, how hard you play, and of course assuming that both the bridge saddle and nut are properly cut and the action is adjusted properly.........a string will last 10.293 hours or until it breaks or just sounds dead or maybe longer or shorter times if you call Roto-Rooter when practicing after midnight.

Spaw