There may also be three murders related to the same affair, as in the example you raised. In that case, the convictions are consecutive. That person may be given a 10-year ineligibility period for the first murder because it's second-degree murder and was committed in special circumstances. You understand the situation very well. However, if a judge decides—it is very important to emphasize that this is optional—to add consecutive ineligibility periods, each period will be 25 years. In the case you referred to, the same person could receive a 10-year ineligibility period for the first murder, 25 years for the second and 25 years for the third, if that's what the judge decided.
Evidence of meeting #39 for Justice and Human Rights in the 40th Parliament, 3rd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was murder.
A recording is available from Parliament.