Precisely. If David is sent a message he replies within 24 hours, though the majority of the time it's within the hour. I've gotten responses back from him from questions that I sent him at 9 or 10 pm my time (which would be 3 or 4 am in England) within minutes. I'm convinced the guy either doesn't sleep or is a half humanoid/cyborg that doesn't need sleep.
But yes, historically, orders are cut off about 2 or 3 months before a mold is scheduled to run. If HHR runs this fall or at the end of the year, I would make sure it's in soon, just to be safe.