Is it normal for an examiner to bring you back in early?

I passed my test today with just 2 minors one for stalling on a hill and the other for my reverse bay park manoeuvre inside the test centre. I am just wondering if it is normal for an examiner to take you back early from a test. I was told that I would be driving for at least 40 minutes of my test yet I left the test centre at 9:00AM and got back at 9:30AM, the test seemed oddly short and was not what I was expecting. Is this normal?