I got approved from Nebraska Service Center within a month from the day i sent my renewal via express mail to Dallas Lockbox Facility
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App sent:08/25/12
App received: 09/04/12
Bios letter: 09/13/12
Bios done: 10/09/12
Approved: 11/06/12
SSN Applied: 11/13/12
SSN Arrived: 11/19/12
Renewal Sent: 09/05/14
Received: 09/08/14
Biometrics Appt:10/03/14
Walk-in:09/23/14
Approved:10/03/14