How Many Days
What Day, Which Day
What day equals the fairly obvious translation "what day." But, it also means how many days.
This is a jukugo word, which usually means on'yomi readings from the kanji, but 何 actually uses the kun'yomi reading here! And since 日 has two on'yomi readings, here's a mnemonic to help you remember this reading:
How many days does it take you to bake a naan Nietzsche (なんにち)? It's not easy to make a Nietzsche entirely out of naan, so I wonder how many days it would take.
What month and what day?
What's the date today?
What day in January?
How many days will you take off from your part-time job?
What day's good for you?
How many days were you stuck in the elevator?