за один

in one; for one

→ за
phrase Common #8,022
in one; for one Used with a masculine noun in the accusative; the form changes to за одну with feminine nouns and за одно with neuter nouns. It can indicate the time needed to do something or the price paid for something.
RU: Она закончила работу за один день.
EN: She finished the work in one day.

А ты спроси у него, это две за оба или за один?

Ask him whether that’s two for both or two for one.

— Брат 2 (2000)

Это можно сделать за один-два дня.

This can be done in one or two days.

Он прочитал книгу за один вечер.

He read the book in one evening.

Я потерял двух Мэй за один вечер.

I lost two Mays in one evening.

— Чунгкингский экспресс (1994)