English Translation
You never know when an earthquake will happen.
The transcript as well as TTS are incorrect. 「いつ何時」should be pronounced as いつなんどき, not いつなんじ. It’s a set phrase.
- なんじ for 何時 means “what time” (e.g. 7:35pm).
- いつなんどき means “anytime in your life” (e.g. during sleeping, taking a shower, while being sick, etc.)