Let's analyze you, because it's not about the b1tches, it's about you.
If you are worrying what hour to call her. Why is that? Because you are afraid what if she won't pick up. Such as what if she had party last night and sleeping.
Problem with that is that you placing value on the b1tch. She's just a hoe.
A proper thing to do is call her when you feel like it. If anything, that's her miss.
Adopt this attitude, it helps with your internal and external states, so that b1tches know what's going on first time they see you.