Is it normal to not talk to your boyfriend everyday ?

I am all about giving a person your dating their space. my friend has a fit when she doesn't talk to a guy she is seeing for more than 3 hours. I don't understand how girls get so upset when he doesn't call. sometimes I don't talk to a guy for more than 3 days. I know he works hard and he is tired. so tell me its normal not to talk to your boyfriend everyday?
Is it normal to not talk to your boyfriend everyday ?
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