[NJ_gent]

"Giving consent to a cop to look thru your vehicle IS NOT CONSENT TO BE ILLEGALLY DETAINED for 20+ minutes while"

Did you ask if you were free to leave? If you did, the officer must either arrest you or allow you to go on about your business unless he's got a damn good reason to continue holding you. Even then, he's probably got a few minutes at best to work on you before you can hop in your car and drive away. The trick is, you have to ask.