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Isn't it something like. Longer than a day, or shorter than a year, or a year, then you use prepositional.

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Well, there's ways around that.[/quote]

Yes?
When you're learning Russian, your mind gets bent in awkward directions, like it means "for", but that is not how Russian is. It's hard to let go of...

The problem with this website is the examples are using nouns which look the same in the nominative and accusative.

Завтра is an adverb so it has no case.
Лето is neuter, so Лето in the...