Coyotes have A.D.D
if your fishing, you don't start reeling the lure in and then stop half way and drink a soda and then start reeling again do you?(I don't)
I have watched to many coming in on a sting.. Turned off the call, and seen them stop and start mousing.
Then turn the call on again and they have started coming in again, or worse, they now just ignore.
I get taking a break when you are hand calling. First you would pass out if you didn't. (or i would anyways) Second, you take the break to make them come looking for where that sound came from but you take a break so that you can shoot and surprise them when they come looking. I have personally had friends hand calling had coyotes run right in and get within 10 yrds finding that rabbit. So in those cases i get the break.
The other side is ecaller and decoy setup..
I set that out and put myself in the best shooting position, while the call is in the best place to attract the coyote. In this case i just let it roll.