When they repossess your car?

1) are you required to pay the full payoff amount at once 2) how much time do you have to pay it off 3) what are the fees of respossession and towing 4) would it be better if you voluntarily give away your car with an estimate for the payoff amount? 5) what if they cannot find your address and the car, do they just put collections and fees on you, even though you still own the car and they cannot track it? Please give me a very detailed answer with what you know. I hope someone smart comes on here who knows about this stuff and answers.