Beyond that specific case, there are a number of rules that can be used to make sure duty-free allowances are difficult to abuse (not all of them might apply to any one country and some might be difficult to enforce):
Regarding enforcement, many borders in Europe are quite "soft" (certainly compared to earlier times or other parts of the world) and you will often get waved through or walk through the green channel at airports without anybody talking to you or looking through your stuff. Customs agents rely on random searches or simply noticing that something seems odd (like a car showing up frequently) and, if it comes to that, they can ask you to prove you did not break the rule (the burden of proof is on you). Another way many people get caught is simply tips: from jealous neighbours, estranged spouses, competitors, etc. None of this is systematic but that’s how it works for all customs rules including checking that travellers are not exceeding the allowance itself so any 24-hour limit would not be unusual in that respect.
To answer your question (and also limit the answer to entering Norway), Norwegian custom rules only allow you to make use of the duty free allowance once every 24 hour.
Quoting from Norwegian Custom’s information page on the duty free allowance:
Hvis du er i utlandet kortere enn ett døgn: Ved utenlandsopphold på
mindre enn ett døgn kan du én gang i løpet av 24 timer ta med deg
alkohol- og tobakkskvoten hvis du kan dokumentere at du har betalt
avgifter i et EØS-land. Du kan derfor ikke handle på tax-free.
Or my rough translation: If you stay abroad for less than one day (24 hours), you can once every 24 hours make use of your free alcohol and tobacco allowance if you can document that you have bought the items with duty in another EEA country. You can therefore not bring items bought tax-free.
Credit:stackoverflow.com‘
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