Went there early, stood in line for about 30 minutes and paid QAR240 at the window. After paying, you will be guided inside another room where you have to wait for your turn to have your details and photo taken. It just takes a few minutes depending on how many people are ahead of you. I received a text message to claim my passport in about 2 weeks. It usually takes 1 month or so. I just got lucky:)