What is the range of sentencing in second degree murder cases?

In R v. Nash 2009 NBCA 7, , Robertson J.A. in discussing the ranges of sentencing imposed in second degree murder cases observes that (para. 54): ...Not only are these cases instructive, they provide support for a general thesis: more often than not, trial and sentencing judges work with three time frames when fixing the period of parole ineligibility: (1) 10 to 15 years; (2) 15 to 20 years; and (3) 20 to 25 years. In practice, the third time frame is reserved for the "worst of offenders" in the "worst of cases". The first is reserved for those offenders for whom the prospects of rehabilitation appear good and little would be served by extending the period of parole ineligibility other than to further the sentencing objectives of denunciation and retribution. The second time frame is reserved for those who fall somewhere in between the first and third. Obviously, these time frames are not cast in cement and represent a basic starting point for analysis.