I disagree with the premise that a month of non-communication is reasonable. But, at the same time, more than 1 email/week can be interpreted as harassment. So be patient. That said, Kent always comes through in the end.
1 caveat - my experience has been that, over time, Kent may forget some of the details of your original request, which can have disastrous results if not caught & corrected before he finishes your job. However, Kent does admit his mistakes & tries (as best he can) to correct them. (After a 3-month delay, Kent apparently forgot that I had requested white, non-glowing lume on my double red & ended up painting the dial with brown luminova. Fortunately, he was able to repaint over the brown markers & still make it look gen.) For this reason, it is imperative that, as soon as he does resume contact, you reiterate the details of your original request. Otherwise, if the work gets completed (incorrectly), it may be too late.