How much longer?

Your English tip for today is a very useful phrase:

HOW MUCH LONGER?
Say it alone - or in a sentence.
Examples:
A: Is dinner ready?
B: Not yet. 
A: How much longer?
B: 10 minutes.

A: Are you finished university yet?
B: No, I'm still studying.
A: How much longer?
B: 1 more year.