As part of today's statement, the Fed acknowledged that it would be maintaining the current QE rate until unemployment hits 6.5% or inflation gets out of hand (paraphrase). Below is an estimate of when unemployment could hit that level based on an extrapolation of the current pace of decline. Since peaking in late 2009 at 10%, the unemployment rate has fallen on average at about 6 basis points per month (.06%). If it continues at this pace, the unemployment rate would hit 6.5% in mid 2014.
[Note that the decline has not materially picked up much pace in 2012. In 2012 the rate declined by an average of 7bps per month. At this pace 6.5% would occur just a few months earlier in 2014.]