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Well it depends on the environment I am in.
I spend most of my time in Mainland China. Some cities tend to be cleaner than others and my trouseres (usually sportswear) hardly gets dirty. In those cities I changed my pants every 2 weeks. But in those highly polluted cities, where I never dare to wear light-colored pants, in 2-3 days I find my dark pants covered with dusts that I have to change them.
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