Time is always an element, a factor, and the nice thing is that Canada and NORAD don't have only the fighters; they also have the strategic tankers provided by both Canada and the U.S. to actually carry out the missions.
In this case, at the Canadian air defence sectors and the Canadian NORAD region, which look at the disposition of fighter assets in the Canadian airspace, made the decision to actually keep the fighters in Cold Lake and to scramble from Cold Lake, which is the main operating base. This enabled easier sustainment and leveraged the strategic tankers to provide the reach required to achieve the intercept itself.