How long should I boil crab?

Online Answer
One at a time, grasp crabs as described above and plunge them headfirst into the boiling water.
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First of all, the vinegar will reduce the boiling point of the water present in your steaming pot, thus helping you to steam your crabs quickly. It will allow you to serve the crabs in a better way whenever you are in a hurry.
5.) Once the water has started to boil again, reduce the heat and simmer for the required time. The cras shell should turn a bright orange when done..