I boil them until they start to float maybe 3 minutes on 21/25s and remove. If your are 16/20s go to about 5 minutes. When in doubt pull one and test as soon as they float. Remember once you remove them from the water they will continue to cook. It is better to under cook them then over cook. You can always cook them more, but once over cooked there isn't anything you can do to fix that. Shrimp that are hard to peel are from over cooking not under cooking. I like to ice mine as soon as I remove them from the boiling water. When I worked at the casinos we would boil 100lb batches.
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