This is how I would use any time and whenever in day to day conversation. "When can we meet?" "Whenever you like, I am free all week. " " Ok, how about tomorow? What time suits you?" " Any time is fine. I am free all day. " Here is another very typical conversation. "Thank you so much for helping me. " " Not a problem, any time. Whenever you need me, just ask. " Hope this helps.

You probably need to be more specific. I'm not sure what you are asking.