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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.
After those three days however it is effective in relaxing painful muscle spasms and relieving tension in the ligaments and muscles. To ice your back, wrap a cold pack, bag of ice, or even a bag of frozen vegetables in a thin towel and apply it to your injury for 15 â 20 minutes. Allow your skin to return to normal temperature before you begin to ice again. Never apply ice directly to your back.