I had received approval on 6th january. I have got my unit today ( 8march) . 60 days exactly.  As per dells policy this process requires 40-50 days. I'm happy for my new unit. Thank you Dell, grateful to you all. 
I had purchased Dell's Inspiron 15 3511 on 22oct. And not even a month passed, suddenly it's right side hinge broke. It was not caused by any physical damage, laptop does not have even a single scratch.  I searched about it on google, Dell's official website about this problem and got to know already dozens of people are facing the same issue Then I contacted Dell's technical support over whatsApps.  I have provided each and every information they asked, after 10-15 days, they said the WUR was approved and it will be delivered shortly after picking up the faulty piece.  Now it's more that 2 months, and their team is only giving automated replies and hopes. I have told this thousands of times to the team that I am final year graduate student, this is the most crucial part of my career, every friend of mine are brushing up their skills and getting placed, and here I'm sitting and waiting for the laptop to be delivered.  I have asked for  for  laptop with equivalent specs if this particular piece is not available, even an upgrade and even refund, but everytime they're giving me diplomatic answer's. Who's going to bear this loss. I'm under tremendous pressure. My situation is worst in this time period as I cannot wait more and more and also cannot buy new laptop. Only thing I can do is wait wait and wait.  Please help me out, if anyone got solution to this  
WUR not done, it was approved 50days ago.