いない間に

while someone is away

→ 居る
phrase Rare #22,809
while someone is away Used for an event that happens during the time someone is absent. 間に can also follow other forms of いる to mean “while someone or something is somewhere.”
JA: 私がいない間に、荷物が届きました。
EN: A package arrived while I was away.

君のいない間にジョーンズさんて人が来たよ。

While you were away, someone named Mr. Jones came by.

私のいない間に誰か訪ねてきましたか。

Did anyone come by while I was away?

あなたがいない間に古いアルバムを見ていたらこんな写真が出てきたの

While you were away, I was looking through an old photo album and came across this picture.

— When Marnie Was There (2014)

私のいない間に日記を読んだのは一体誰だ。

Who on earth read my diary while I was away?