When should I give up on a guy when I text him and get no response?

We just started dating and things seemed to be going really good but I work at a restaurant/bar so I work bad hours and we haven't been able to connect. How long should I wait for this guy to get back to me. I don't wanna seem needy so I've only text him a couple times but so far to no avail...
When should I give up on a guy when I text him and get no response?
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