re: Best timeframe to see a new country?

quote:

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Portugal-
United Kingdom-
France-
Spain-
Vienna -
Budapest -
Amsterdam -
Germany -
Poland-
Netherlands -
Belgium-
Sweden-
Czech Republic -
Hungry -
Austria-

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You might want to fix the above issue, but to answer the main question, I don't think that there's an answer. I've been to 43 countries, and I'll give a few examples.

Iceland works great as a Reykjavik stopover for 2-4 days on your way to or from another European country, but driving the Ring Road really takes 9 days or so. I personally don't think visits of 5-7 days really make sense.

You really don't have to see all of a country to have a great visit. When I went to New Zealand, I just spent a week in the southern half of the South Island: Queenstown, Mt. Cook, the Routeburn Track, and Milford Sound. And that was an awesome trip.

I spent 17 days in Peru and visited Lima, Trujillo, Chiclayo, Cuzco, Urubamba, Machu Picchu, Lake Titicaca, Iquitos and the Amazon, and Tarapoto. And that was an awesome trip. But I missed Arequipa, Nazca, and Kuelap; and I think that all those areas are worthwhile.