Parents GC filed. How long after finger printing?

[parent_gc]

Dear All,

- Filed for my parents' GC - July 2008.
- Fingerprinting was done- August 2008.
- Received advanced parole document - September 2008.

Any idea, approximately how long it takes to get an interview scheduled after fingerprinting is done, assuming there are no issues with FBI background check.

Also, approximately how long it takes to get GC in hand after fingerprinting stage?

Any help is appreciated.

Thanks in advance.