In your application, you are able to directly designate the countries in which you'd like your Trademark to be protected. You can designate any number of countries as long as they're a member of the Madrid System. The registration for international Trademarks will last for 10 years and all associated fees are paid to the WIPO.
Like any nearly "perfect" system - the System has its flaws - namely that all nations globally are not a member of the Madrid Agreement. The benefits far outweigh the disadvantages by far. Even in the event you wish to register in a country singularly that is not included- you're able to file one application for many other countries in bulk.
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