It takes me 90 minutes to drive to EW, going about 75mph. Takes about 2 hours 15 minutes from where I live to drive to AC doing the same speed. Taking the turnpike to EW, the GSP to AC.
Guess it depends on where you live. For people in NNJ anything below Morristown and Newark is kinda like SNJ to us, lol. The usual barometer: is your drive south 60-70 minutes? That's central jersey to a northerner. You start driving 75 minutes or more and sure feels like SNJ to us.