How do you say 5 days in Japanese?

The word for “5 days” in Japanese is “go nichi kan” (ごにちかん).

Here are some examples of how you can use it in a sentence:

・5日間は雨が降っています。(Gonichikan wa ame ga futte imasu.) It has been raining for 5 days.

・私は5日間旅行に行きます。(Watashi wa gonichikan ryokou ni ikimasu.) I'm going on a 5-day trip.

・5日間かけて論文を書きました。(Gonichikan kakete ronbun o kakimashita.) I wrote my thesis in 5 days.