None.
Wash your jeans when they get dirty as you would other items of clothing.
In general pants need to be washed less frequently than shirts, but not that much different.
I can usually get 1-2 wears out of shirts and 3-4 wears out of jeans before they are stained, dirty, or stretched out.
All that crap about wearing jeans for months without washing is just nasty and unhygienic.
TLDR: Wash your jeans every few wears. They aren’t magical.
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