I have read that the life span of AEFW is 2 weeks without any food source. I have been dealing with this same problem for a few months. Based on my observations these worms are very risillient. I have pulled an AEFW out of water for an hour. Placed it back into water and it was still alive! I have experimented with different methods of killing them. I have used Iodine and revive dips. Even fresh water. For the most part iodine treatments seem to work best, but it doesnt exactly kill AEFW. My observation shows it just stuns them and they fall off the coral. If you can preapre fresh water to have the same temp and PH as your tank that might work best. After testing with many AEFW worms the longest Ive clocked them to live in fresh water is 45 seconds! I have dipped atleast 50 worms in fresh water to get that average. My ultimate goal is to move them into a tank where I can control their food source. I am very interested to see how long they can go without a food source. I also want to breed them. Would be nice to get some exact answers on life cycle of this pest. To answer your question I am pulling my remaining accropora out of the tank for 30 days. I hope that is long enough to rid the tank of this horrible parasite.
Remember, you cant put your frags back into display tank after dipping. They will be reinfested eventually. Your corals should be dipped and put into QT. During this time check for eggs and any remaining AEFW. If the 2 week life cycle is true you should have hatched AEFW in your QT tank incase you missed any eggs. But better in QT then display. Im sure they will all be gone from the display after 30 days. 30 days might seem like a lot but Im not risking it again. AEFW ruined my tank. Good luck!