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If you plan to visit Latvia, then you will likely have to make the most of the Latvian authorities' Latvian visa waiver. It's highly advisable that you apply for a visa early on to prevent disappointment. In most cases you are able to wait up to 3 years between the date of your last visit to European countries and the day once you get a visa. Thus you can still see European countries for up to a year with a Latvian visa waiver.