May I borrow it for a day or two?

这个我可以借用一两天吗？

《牛津词典》

You'd better stay at home in the warm for a day or two and drink plenty of water.

你最好在家里暖和一两天，多喝水。

youdao

They've been making a low continuous sound for a day or two.

它们已经连续一两天发出低沉的声音了。

youdao

For a day or two she walked around in a dreamy state as she thought about her choices.

VOA: special.2009.09.05

He spoke for almost two hours on a cold and rainy day, without a hat or overcoat.

VOA: special.2009.01.19

They moved from one empty city to another, never stopping for more than a day or two.

VOA: special.2010.07.17

But it would be wiser to avoid road travel for a day or two.

CNN: Frosty swath brings snow from Dakota to D.C.

For a day or two, Errol will look grim and spend a lot of time in the betting shop.

NEWYORKER: Magda Mandela

In a worst-case scenario, some Olympic events may have to be put off for a day or two until the pollution clears.

NPR: Beijing Races to Clear Its Skies Before the Olympics