I;ve had some of my frags grow over and around their plugs in just a few months. I have a zooa issue, way too much already. lol Xeia will spread ike a plague, that I promise you. My frogspawn syarted with one head adn now has three after about 5 months.
Some corals grow very rapidly while some are very slow. Alot will depend on yoru lighting and water quality.