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Ice is better than heat for an acute injury during the first week. Most people stop icing after the first day or two unless they're very uncomfortable. No longer than 15 minutes at a time with a hamstring. If it were a toe or a finger, no more than 10 minutes as cases of frostbite have occurred. Always a good idea to place the ice in a plastic bag and place layers of paper or cloth towels between the bag and the skin. Remember RICE - rest, ice, compression, elevation. Generally 15 -20 min is maximum for icing an injury.
Bring an ice chest or some other insulated container to hold the Dry Ice and slow the sublimation rate. Dry Ice sublimates faster than regular ice melts but will extend the life of regular ice. It is best not to store Dry Ice in your freezer because your freezer's thermostat will shut off the freezer due to the extreme cold of the Dry Ice! Of course if the freezer is broken, Dry Ice will save all your frozen goods.