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| Thanks. Quite strange you needed to bring such a letter. I mean, the permit states the exact arrival date already. | |
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The 12 month clock starts running on your first entry to Switzerland.
You might have made 2 tours here, 1 of 4 months and 1 of 9 months. The 12 months time limit is finished 8 months after your first exit, not during your second visit! This is why you need the letter stating when you first came to Switzerland.
It is always best to apply for the license as soon as is reasonably possible.