I've shopped around but never placed an order through GLA but I've asked many many questions through his website. Now, I've not received an email response at all when I've copied the email and pasted it into my own email but every question in multiple inquiries were rapidly answered when I used their online questionaire tool.
So, not sure which method you used. If, you tried to simply take his email address down then send one rather than using the website customer service tool then I'd suggest trying that method first. If then you still get no response after a day or so (during the work week) then I'd say could be an issue.
My main concern with GLA is the fact that I could not find a single phone number to call and physically ask questions nor could I find the business registered with the Better Business Bureau.