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Preposition додо in this meaning (up to 21 hoursup to 21 hours, can be less,but but can't be more, because 21 shows maximum or limitmaximum or limit) requires genitivegenitive case.
Up to — до двадцати одного часа.
Preposition до in this meaning (up to 21 hours, can be less,but can't be more, because 21 shows maximum or limit) requires genitive case.
Up to — до двадцати одного часа.
Preposition до in this meaning (up to 21 hours, can be less, but can't be more, because 21 shows maximum or limit) requires genitive case.
