How to say “They've been in the briefing room for an hour, so either something big happened overnight or someone forgot to end the meeting.” in Japanese
In Japanese
もう一時間もブリーフィングルームにこもってるよ。夜中に大きな事件でもあったのか、だれかが会議を終わらせるのを忘れたのか、どっちかだね。
Mō ichijikan mo burīfingu rūmu ni komotteru yo. Yonaka ni ōkina jiken demo atta no ka, dareka ga kaigi o owaraseru no o wasureta no ka, docchi ka da ne.