This is my favorite question! First off, a swordfish is 30+ miles offshore and each drift can last up to forty-five minutes. Second, Mahi can be anywhere from 10-30+ miles offshore. Yellowtail and grouper are typically found on the reef. So to answer the question, in a ½ day, no that is impossible.  It is always best to book the trip length you are comfortable with and let the Captain read the conditions and see what you have the best chance of catching but you certainly should let him now what your goals are.