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за три часа

in three hours

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phrase Rare #40,038
in three hours Indicates how long it takes to complete an action. It refers to the total time needed, not an action continuing for three hours.
RU: Я приготовлю ужин за три часа.
EN: I'll prepare dinner in three hours.

Мы добрались до Бостона за три часа.

We got to Boston in three hours.

Том закончил работу за три часа.

Tom finished the work in three hours.

Том прочитал всю книгу за три часа.

Tom read the whole book in three hours.

Он сможет сделать это за три часа.

He’ll be able to do it in three hours.

Я прочёл эту книгу за три часа.

I read this book in three hours.