Awaiting DUF Number: Over 3 Weeks Post-Application Submission

That is normal. In the end you need to check the website which tells you about the waiting time for your case. Usually when you submit the documents to a vfs/embassy, it is forwarded afterwards to the UDI in Norway. After that, the UDI assign a duf number to your case and put it in a waiting queue and keeps sending you monthly notification email. The email says whether your application is waiting in the queue. It is an automated email. Once an officer receives you application document for processing he will process it and you will receive a grant, rejection, or an inquiry for extra documents.

the UDI assign a duf number to your case and put it in a waiting queue

That's the thing. They already received my application last March 26th but did not assign a DUF number yet (so, I'm not even in the waiting queue).

I read online that it usually takes within one week for the DUF number be given thru email, that's why it bothers me that it is already 3 weeks and I still have not received it yet.

@chandlertimmdoloriel any update on your UDI? i am now on the same situation.  Now on my 4th week waiting for UDI. 

@chandlertimmdoloriel Have you received DUF Number?

@Ahmed Abdul-Gawad Thank you for the information. How long will it take to get VISA approval after the creation of DUF number?