Not sure what your work schedule is like, but if there's an opportunity to listen for a bird at day break briefly and then go back for him once off work, your odds of success will substantially increase. Even if you heard him a few days ago, knowing where he lives is a large part of the game. Once he loses his hens mid-day or redirects his attention to finding hens to roost with in the late afternoon, just knowing the general area where the bird frequents is very important to success during the hours with which you'll be out there. Don't get discouraged if it takes an hour or two of silence, either. With afternoon turkeys, I feel like sometimes they will hear and approach the call, but do not gobble until they get within that 150-100 yard mark. So set up where you know a bird lives, be patient, and take each gobble as an opportunity to understand where he wants to be and where you need to be to kill him.