How long should I wait for a text back (it's already been 2 days)?

There's this guy I've been seeing. We do not text often-maybe 2-3 times a week at most. Normally he responds within 24 hours. But he went on a trip recently and before he left he agreed to my text saying that "we should go on another date". Since he left on vacation he stared texting me hella often-it was unusual but not a surprise since he had all this free time on vacation and he was excited to show me where he was and the places he was seeing for the first time. But he got back from his trip today and hasn't responded to a one sentence question (what's the name of his new cat?" I sent two days ago. I am getting a little nervous because he has never taken two days to reply and I only sent a few words to which he could have just sent one word (the name). I probably will get a lot of people wondering why I am concerned over a little thing but it's not just the timing, he is also active on social media. All day he has been writing statuses and posting memes and other photos on instagram and facebook. Last thing he shared was a news story just an hour ago. Do i send him another text to ask if we are still gonna meet up (he still hasn't given me a time or date)? Or will I come across as needy?
How long should I wait for a text back (it's already been 2 days)?
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