At what time? Used to ask about time.

• Introduces direct or indirect questions about time.
• After a noun in isolation, expresses impatience.

At or during the time that; as soon as.

• Whenever; at any time that.
• In conditional statements, meaning if.

At which, on which, or during which.

• The time at, on, or during which.
• A situation or circumstance in which.

What time; which time.

The time at which something happens.

That's enough, used to tell someone to stop pouring.

• Expressing impatience.