Drafted a college guy in the 1st supp round who might sign if the deal is right. Offered initial demand. He responded immediately. I’m assuming I should sit tight, wait for him to accept, decline or counter. However, it’s been 4 calendar days so I wanted to make sure I wasn’t misinterpreting his response.

Your offer has my client's attention, but Jim is considering returning to college for another season. We'll contact you if things change. Until then, we'll consider the offer on the table

Just wait it out, sometimes they don't let you know until very late in the season.

Usually he'll give you a response by around the 7th real life day, although the exact timing varies.