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The timer starts when the fighting begins (when the big TV is first surrounded by smaller ones) and ends when you destroy the boat on the pier. If you have preserved flare gun shots it is too easy. As for the woods, the best tactic is probably to make a run for it, boosting your flashlight to your pursuers to slow them down when they get close. If you can't do that, take your time using the Boom! words (don't take too long though, always keep moving)