Variable objective timers for different missions to allow for more varied gameplay

Currently, the timers for the various mission modes (intel gathering (computers), target elimination, hostage, and bomb defusal) seem to be all roughly the same time limit to complete the primary objective. This currently leads to a lack of mission flavor as well as tactical gameplay as certain playstyles (i.e. silent, slow, and steady) are rendered ineffective as players are faced with tight timelines and searching for enemies to replenish the timer. In the alpha public test it feels as though the only way to play is to rush in hard and grouped up as any meaningful tactics might take 1-2 minutes off the clock to set up which already puts you at a disadvantage compared to just group breaching and rushing the objectives.