Why does it take some guys 1-2 days to respond?

Seriously this is so annoying. Some guys show clear interest (ask the girl out) but then take 2 days to respond. It is weird. Clearly, it is intentional but what is the meaning of this.
They don't want to seem too eager/desperate
They are not that interested in the girl probably
They are probably talking to others as well
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Why does it take some guys 1-2 days to respond?
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