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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.
1 When using dry ice for cooling foods, place the dry ice in the BOTTOM of a cooler, refrigerator, or insulated container. 2  Do not allow foods to have direct contact with the dry ice. 3  Place an insulating material â such as cardboard â between the dry ice and food. 4  Do not put dry ice in your drink. When using dry ice to keep foods frozen, place the dry ice ON TOP of the items you want frozen. 2  A small block of dry ice (5 to 7 pounds) wrapped in an insulating container has an effective cooling time of 18 to 24 hours.