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To conserve time, when you have the song of time, play it backwards. Time will slow down. You now do not have to worry about not finishing a temple on time, nor worry about taking to long on something. Slowing down time will make you have twice as much time as you used to have. No, it doesn't mean you have 144 hours. Time is just slowed.

If this doesn't seem to help your game play, preread the walkthrough and understand what it is you need to do. Make sure you know what you need to do, then do what it is you need to do to beat that temple.