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The larger the stone, the less chance it will pass on its own and the longer it will take.
- Kidney stones smaller than 4 mm: About 80% will pass on their own. Typically takes 31 days.
- Kidney stones from 4 to 6 mm in size: About 60% will pass on their own. Typically takes 45 days.
- Kidney stones larger than 6mm: About 20% will pass on their own. Typically takes 12 months.
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