How long is too long to wait for a response from a busy man?

He states he is a introvert. We've only been trying to get to know each other for a couple weeks now. He's a busy man & I'm a busy woman so I'm respecting his boundaries at most. So we're both in the mindset of not wanting anything serious at the moment. I'm the type to make time for what she wants. One thing I don't like from our conversation about 2 weeks ago was when he said, "I don't think you should be wasting your time w/ me". I've been wanting to reach out for some clarity however, I don't want to sound too pushy or pressure him into something.

How long is too long to wait for a response from a busy man?
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