I've been using this type of Call for as long as I've been hunting. Down here in Florida, it works well all year long. I use it blindly when I don't see any deer. I generally call for 15-30 seconds...loudly and desperately. Put as much emotion into the call as possible. Sounds funny, but pretend that you're a little fawn that's lost and wants its mommie. After each sequence, I wait...bow in hand. Sometimes, does come running in with a few minutes...sometimes they don't. But it works more times than not. These Calls can even lure in young bucks. During the rut, you may bring in a mature buck if he follows the does in to your calling. Either way, you should see something after a while. If not, do another sequence every 15-20 minutes. The louder and more desperate the better.

Good Luck!