How long does it take a guy to text back if they are still interested, and how long should I wait before assuming he's not?

Met a guy we talked for hours. It was a good Convo. We laughed we flirted. The longest he went without texting me was about 2 hours. And that was only because he was working. However, out of nowhere it changed. Suddenly he stopped texting me all together an hasn't even looked at the message I sent. At first I just assumed he's busy and have just kind let it be but, It's been a full 24 hours and I have been ghosted in the past. So. Just wondering how long do I wait to see if he texts back?

How long does it take a guy to text back if they are still interested, and how long should I wait before assuming he's not?
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