When to use calls?

[DJanes1]

I am going to try and use a grunt call and bleat call this season. The rut just started and am wondering when to use the calls and how often? I have primos bleet cans, and a night and hale grunt call. The deer are pretty thick and I saw 5 bucks last night and one 8 point this morning. No hunting on sundays in North Carolina. All advice will be greatly appreciated. The 8 point this morning was tending a doe.

[Natalie]

for the bleet cans, i was told do it once every 20minutes