He only texts me once a day. Is this normal?

Been speaking to a guy from PoF, really cute and interesting. We exchanged numbers and now talk over WhatsApp. He only texts me once a day though, we exchange quite long messages, and when I reply I never hear from again until the next day. He never seems to really use WhatsApp, judging from he's last online. Admittedly, I sometimes take several hours to reply due to work but I always respond when I can. Last week he asked to go for a drink this weekend but I'm having doubts. I don't know if this is just his phone manner or if he's not that bothered? I'm going to wait for him to confirm the plans for the weekend, if not then I know he was a time waster.

He only texts me once a day. Is this normal?
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