My friend Pahoo is again, spot on.
Over the years, I've learned to mostly let the turkeys dictate my calling.
There are days when it seems you can slam the truck door and every gobbler within earshot will sound off. Other days, doesn't matter what you do you'll not get a response.
These are the days your mind can play many tricks on you making you doubt yourself...am I not calling enough...am I calling to much...to loud...to soft? Are there any turkeys in the area? Even though you know there are. IMO, these are the real learning and patience testing days of a turkey hunter.
If the turkeys are talking, I'll talk. If they aren't, I hold my calling to a minimum calling softly every 30-45mins. Too, on these days stay alert as most likely if a bird comes in he may not gobble at all.