How long before it kicks in

Hi, have been on 200mg sertraline for a long time. Recently started on quetiapine 200mg XR plus the option of 25mg IR up to twice a day as needed. My diagnosis is GAD, SAD and depression. My question is how long does it take for the anti depressant effect of the XR quetiapine take to start working. I started about 2 weeks ago. While my anxiety has improved, my depressed mood has not started to get better (if anything it's slightly worse). Thanks