This Winter I've been listening to my dog bark. He's a lab so typically when he barks it's usually for a reason. He has his I want to come in bark.. time to play bark. And sometimes, he's just letting everyone(other dogs) in the area know he's around.
After a good night of barking, I've noticed a dog come tooling through the yard.. maybe not till the next afternoon. And you just know there was some communication involved.
Sometimes it takes more than a day.
It just really helps reinforce for me how moose calling works. They hear it, and they'll come when they feel it's a good time.
It's helped me see the value of calling from several different areas, and making a plan to have a view of the areas I've called and critters that wander over to see what's up. More than anything learning it's a patience game.