
You must have lived in Switzerland for at least ten years, including three of the five years immediately before you apply. Years spent here between ages 8 and 18 count double, but you still need at least six actual years.
Ordinary naturalisation requires a substantial period of residence. The federal rule is ten years in Switzerland, of which three must fall within the five years directly before the application.
To help people who grew up in Switzerland, time spent in the country between the ages of 8 and 18 counts double toward the ten years. Even so, the law sets a floor of at least six years of actual physical residence, so the double-counting cannot reduce the qualifying period below that.
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