いつの間に

いつのまに

when; at what point

Also written 何時の間に

Meaning

expadv
when; at what point

Example sentences

あれ？いつの間に雨が降ってたんだろう。全然気付かなかった。

Eh? When did it start raining? I didn't notice at all.
「あれ？ここにパン屋さんなかった？」「それなら、とっくの昔に潰れちゃったよ」「うそ、いつの間に？」「半年前ぐらいかな」

"Huh, didn't the bakery store use to be here?" "Oh, it went bankrupt a while ago." "Really? When did that happen?" "I think it was about half a year ago."