How Long to Boil Mussels
It takes about 5 minutes to cook mussels in a pot with boiling water. However, it's not a true boil, as the water shouldn't cover the mussels. You'll want to put about an inch of water or other cooking liquid in the pot and bring it to a boil. Then, add the mussels and put a lid on the pot to let them steam. Take off the lid for a couple of minutes and give them a stir, then put the lid back on and let them finish cooking. Throw away any mussels that haven't opened at this point, then eat the rest!