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いつの間に

before I knew it

→ いつ
phrase Rare #29,277
before I knew it Used to express that something happened unnoticed or during an unknown interval of time. Often followed by か, especially in statements; questions may use いつの間に？ to mean “when did that happen?”
JA: いつの間にか春になっていた。
EN: Before I knew it, it was spring.

いつの間にこんなに積もったの？

When did it pile up this much?

— 親切なクムジャさん (2005)

いつの間にこんなに大きくなっちゃったんだろう

I wonder when you got so big.

— 魔女の宅急便 (1989)

一体いつの間に覚えたんだ？

When did you learn that?

— ニュー・シネマ・パラダイス (1988)

いつの間に？

When did that happen?

— バーフバリ 伝説誕生 (2015)