a standard spark plug should last 10-20K KM...those better/performance type should last 30-50KM....
Spark plug is wear and tear part...
Also life span of spark plug depend on your engine condition...if your engine makan engine oil / wrong tuning then your spark plug will wear out faster.
Guys, how come my digital AC is now dead? Normally the screen will turn blue when I turn the key but now its always dead and no function. If I turn on the lights the buttons will light up but not the AC. And funny...