When you are either bored with a conversation you're having with someone or just want to end it you tell the person"you're wasting my daytime minutes."
It refrences a limited amount a minutes you can use on your cell phone often refered to as anytime or daytime minutes but applies it to conversation in this case.
Stop bugging me, your wasting my daytime minutes.
I'm almost out of daytime minutes, so this conversation has to end soon.
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