How long the case takes is actually measured from your filing date.
You can see the processing times at the link below depending on where your case is:
https://egov.uscis.gov/cris/processTimesDisplayInit.do
Sincerely,
Rehan Alimohammad
Attorney at Law & CPA
Law Offices of Rehan Alimohammad, PC
Houston Office: 281-340-2074
Toll Free: 800-814-3920
Fax: 866-240-0629
www.attorneyrehan.com