This question was recently raised on our Shoalwater trip where the GT's just weren't biting - how many casts do you pepper an area with before concluding the fish aren't home and moving on? Personally I tend to do maybe 2 to 3 over the prime points of an area and if there's no interest I conclude no one is home and am happy to move on. My mate however was happy to cast at the one point for 15 minutes or so. He doesn't usually chase Gts but it made me think that perhaps i'm being too hasty? My experience has been that if there are fish in the area the response is usually instantaneous, with less and less interest as you continue to cast - hence why i'm happy to move on after, in some cases, barely 5 minutes at a particular spot.
What do you do? And do you find any merit to persistently casting for say 15 minutes even though there has been little or no interst early on?