Most local folks I discuss this case with believe that an M1 conviction in Canada is 25 years. And articles like the link below help spread that assumption.
http://www.chch.com/situations-dellen-millard-mark-smich/
M1 is a life sentence, with an
eligibility for parole only starting after serving 25 years. I believe they can apply for a "faint hope clause", a statutory provision that if approved would allow them a parole hearing after 15 years. It's difficult to get approval, especially in an M1 conviction from what I understand.
I have no idea how a parole hearing weighs the crime to the behavour, redemption, etc., exhibited during incarceration, but IMO, these two will not win approval for parole after 25 years, even if the Judge chooses concurrent.
Not sure about MS, but I don't see DM ever taking responsibility for his actions in these crimes, and I believe that is something that is evaluated at a parole hearing. But there is always the danger of him putting on an "act" to tell the board what they want to hear. MOO