How to read 二、三日


If you have the two separate words, it's 二日{ふつか} and 三日{みっか}. But how are they
read together? ふた、みっか, に、さんにち, some combination thereof or something else
entirely?

Source sentence for the curious:

> アキちゃんは広いお屋敷で二、三日ゆったり過ごしてくればいいのよ。




It is read 「にさんにち」.

Colloquially, people say 「にさんち」 as well.




It reads に、さんにち (the comma is purely orthographic, you may or may not write it
out).

Similarly, we say...

> 一、二日 いち、ににち  
>  三、四日 さん、 **よっか** ← _irregular!_  
>  四、五日 し、ごにち  
>  五、六日 ご、ろくにち

Longer span equivalents are hardly heard, perhaps because we come to use "a
week" (一週間) or other higher units then, I suppose.

ふた、みっか _might_ actually sound surprisingly comprehensible to native speakers,
but it never exists.

