They need to be replaced when they have worn down to the min thickness. No way to know when that will be
Its like asking how long is a piece of string, sorry
And when you need to replace them a great deal on high quality rotors in on ebay. Look for Meyle rotors at around $75-$80 a PAIR!
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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