How long will it take to get a marriage certificate from India if we are abroad?

Hello, My wife and I currently live overseas and we got married in a church in Hyderabad in 2009. We have used the church issued original marriage certificate for immigration purposes so far. We have since misplaced this original and we are unable to find it for further immigration applications. We have a certified/attested copy of this certificate which is not acceptable by the immigration department. We are looking to get a marriage certificate from the sub-registrars office and we would like to know how long this would take and whether the standard wait time of 30 days still applies in this situation. Due to our leave restrictions, only I'm able to travel for more than 30 days. Can I apply in person without my wife and after the notice period my wife can come over and join me for collection of the certificate? Would this be possible? Is there any way to fast track this? The maximum number of days that my wife can come down for is 1 week only. Any help would be appreciated.