Ever wonder how long you can get away with not registering your car??

So this happened a bit ago but I forgot to tell everyone the exciting story.
As you may know I moved back here a few years ago from Texas. And I LOVE Texas. I love it so much I couldn't bring myself to get rid of my Texas license plates. I decided that I was just going to keep them until someone told me I HAD to change them.
Well people, that day came. I was driving back from a meeting at work when for no reason a cop pulls me over. There were no pleasantries just "License and Registration" to which I answered..."I don't have any registration" well he got VERY upset...and asked me "Have you REALLY not registered your car since 2006!" well no...is that bad??? " Is there any REASON you haven't resisted your car?!" Umm no reason...just lazy. I didn't want to tell him my REAL reason because I don't think he would have appreciated it very much. He was very cranky and tells me to call someone because he is impounding my car. WHAT! do you HAVE to impound it?? can't you just give me a ticket? "NO IT'S BEEN THREE YEARS!!!" WOW, who new three years was such a big deal. So I just informed him that I worked right around the corner so I would just walk! He was really bugged by me...It was weird. It's like he took personal offense to my not registering my car. Whatever...so I called my hubby John and let him know that I had finally been caught and my car was getting impounded as we speak...He wasn't that thrilled but since he knew this day was coming he just complained about how much money I was costing him and left work to come get me out of my little jam. I have to say...we had that baby out in record time. I had the thing registered and out of impound in like 2 hours... SO SUCK IT COPPER!! AND I think it ended up 6's as far as cost goes...SO THERE!! So sadly I have Utah plates now...and I will have to register the thing every freaken year. =(
So for anyone with out of state plates wondering how long they can get away with not registering them....about 3 years.. that's pretty dang good if you ask me =)