system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are paint companies e.g. testing their products for a substained amount of time succesfully? Are they really painting a house and then wait 15 years to see the result?
gpt
They usually paint samples, then test them under wear that approximates 15 years of use. Like super intense uv and weather stuff that may only take weeks, but they can extrapolate to 15 years based on those short weeks of intense exposure.