Now we have only three days to prepare for the birthday party this weekend.

现在我们只有三天时间来准备这个周末的生日聚会。

youdao

Their birthdays are only three days apart.

他们的生日仅隔三日。

《牛津词典》

The answer varies, but to me there are, unexceptionally, only three days, which are yesterday, today and tomorrow.

不同的人有不同的答案，但我看人的一生无一例外地只有三天：昨天、今天、明天。

youdao

Only a few days before Cleveland's second inauguration in eighteen ninety-three, a major railroad failed.

VOA: special.2010.06.17

That is because out of three days and two nights, the families will only see each other for a total of about 11 hours.

VOA: standard.2009.09.26

Mr.Wen says the strongest impression he got from his three days in Pyongyang was that North Korea not only hopes to improve relations with the United States, but also hopes to have better ties with South Korea and Japan.

VOA: standard.2009.10.10

The deal was nailed down, unnamed sources told the Journal, in only three days.

CNN: Doug Gross,

The maggots are used when they are only three days old and around two millimetres long.

BBC: Maggot cure for 'unbeatable' bug

Practising on the moon makes sense because it is only three days travel from Earth.

ECONOMIST: Spaceflight