Dusk,
I'll let the experts advise you, & know how you must feel (I'm at 30 + days of no contact!! Not even a text, nothing!)

BUT, I think your instincts telling you to wait are right. Remember, he doesn't contact you for 27 days, does he really deserve an immediate response? You are a busy, interesting, & exciting person -- his message is nice but you're not waiting around to hear from him! Easy for me to say right?? I'm sure you'll hear from the those who know better soon.