Re: How long to sell?
Sorry you are having such troubles - just be methodical and work through it. Tough solutions are always a series of small steps.
a couple of things I would do:
Call the bank that has your loan and tell them your story today. Ask them what they think you should do.
Start planning your finances factoring in that you can not sell your car for 3 months. Prepare and execute that strategy now.
I assume you are asking what the loan is on the car. Take a loss. Do not default on the loan.
If you just treat this situation as a pain in the *** thing that has to be worked through, you'll be fine. Have a glass of wine.