Simple Questions:
* When did you arrive?
* When will the meeting start?
* When did you last see her?
* When will the movie be released?
More Complex Questions:
* When will you finally be able to afford a house?
* When will the economy improve?
* When will the world come together to solve climate change?
Questions with "What" and "Where":
* What time did you wake up this morning?
* Where did you go on vacation?
Note: While "when" is often used as an adverb of time, it can also function as an interrogative pronoun when it stands in for a noun phrase referring to a time.
Let me know if you have any other questions!