DDS, I have no easy answer for this. Since modding is my work, my workday effectively never ends... and in there somehow I try to fit time for being a good dad, or at least attempting as much... sleeping (not very good at this admittedly)... marriage... paying bills, running errands... etc. God forbid I get sick for a few days, or my parents drop by, which often means the day is shot... with the time left I reply to email and PMs, take photos of builds in progress for later posting, post new threads and photos, pack and ship completed work, order supplies, and of course, do the builds themselves.
None of which really directly answers your question, I'm sorry about that, maybe wanted to outline the above if for no better reason than making sure for myself that I'm keeping things straight!
The more specific answer to your question: there was a time when I spent easily 2/3 of every day replying to PM and email... after several months of this I had accumulated a backlog of perhaps 70+ builds, with a number of folks patiently waiting... and more importantly, came to the realization that try as I might, I would probably never get through all the inquiries anyway, despite wanting to. I just don't like not replying to folks but sometimes it happens in spite of the best attempts to the contrary. :sigh:
Lately I've operated on the philosophy that it's better not to get too far ahead of myself as it helps no one. It's not that I wait until being able to take on a build, but rather that I limit the hours per day spent messaging and in-progress build correspondence will always take precedence, followed by folks who have placed an order, possibly already paid, possibly have their lights on the way... these are the most time-critical communications as I see it. With the time that's left I try to plow through all else.
I receive email notifications even for the PMs and do read pretty much everything soon after it arrives at my inbox... it's the reply part that might take time. Simple inquiries often get a quick response because, well, they're simple. Very long inquiries, or the sort of message asking a dozen questions and/or necessitating long answers to the questions, or inquiries that require research on my part to give an intelligent answer... these are the sorts of things likely to take longest to receive a reply. Sometimes a lack of parts on hand to complete a build coupled with being unsure I can actually get the parts will delay a reply, too, on the premise that I'd rather not get into a detailed discussion of a build I'm not sure can happen anytime soon... don't want to raise expectations only to dash them later if I can help it.
Several months back, many of the inquiries were of the form, "I paid for xxx on yyy, it's been zzz weeks, when will it be done?" Now most have changed to, "I asked about having xxx built yyy weeks ago, and am still interested but haven't heard from you yet." In an ideal world I'd rather have neither of these situations going on, but forced to choose I'd opt for the second over the first anyday! In the second example no money has changed hands, no lights have been sent, no promises on delivery dates have been made... I think it's a lot fairer to have a customer in that sort of wait state than it is to have one who's paid and sent their light into a seeming black hole.
Anyway, the above notwithstanding, I am sorry for the delay in getting back to you and am not offended in the least if you resend the inquiry, or give me a friendly reminder once in a while... I do hope this far too long post does at least offer a tiny window into the strange workings of one very milky brain, and why things happen the way they do.
Thank you for the reminder, too!