How Long to Boil Octopus
It generally takes about 20 to 30 minutes per pound to boil octopus, but this can vary depending on whether you are using fresh or frozen octopus. Usually, freezing can have a negative effect on the texture and flavor of meat, but octopus that has been previously frozen tends to become tender faster when you cook it. You can test whether it's done by inserting a knife where the head meets the legs: If it slides in easily, the octopus is done, but if it doesn't, the octopus needs more time to cook.