The processing of the Federal Firearms License application is handled by the Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATF). The application process involves filling out their application form, ensuring that you meet all of the federal requirements, and ensuring that there are no special state requirements or restrictions that could impact your application.
There is really no set time for how long it will take to have your federal firearms license application license approved. Our experience has been that the earliest it will get approved is 6 weeks, but it could take 8-12 weeks or longer. One thing is certain though, in that dealing with the federal government, they are known for kicking out any ffl license application that isn't completed exactly as required.
This is where having the guidance of someone who has been through the process of how to get ffl can be very helpful. If you know someone who has been through the ffl application process, you would be very wise to give them a call.
Alternatively, there are several places on the internet that provide you with a kit including simple, step-by-step instructions detailing how to get an ffl as well as one-on-one help if you need it. The one I like the best is shown in the Recommended Resource box at the top right of this site. I've also provided a link to hit HERE.