I mailed my application to NJA and never received an "application received" email. I emailed them a month later asking whether or not they received my application. They responded back 3 days later that my application had been received and was on file. From my experience and what I have read here, 4-6 weeks between communication seems to be the norm. I think the number of applications they are receiving and the hiring process is keeping them busy. Good luck.