Extended my family visa today. A busy office, but very efficient - handed in paperwork and paid at the front desk. I had an appointment booked, so just had to wait (we got there early). 40 minutes later called to sign some papers, had photo taken, they had done a 90 report for me, and they handed over my passport. All done in one interaction, so we left 20 minutes before our appointment time. There was no walk-in queue after 13:30 from what I could see.