All of my communications with NJ from application to interview was about 4-5 weeks apart. 1 month after I mailed my application, I hadn't heard anything so I emailed and asked if they had received it. They responded back that my app was recieved. Several days later, I got my email for the phone interview. It was about 1 month between my phone interview and the invite for an in-person interview. The process is probably slower now, but I think a month is long enough to wait before sending an email to ensure they have your application. You don't want to get "lost in the shuffle" of resumes. Good luck.