Between a dollar and a gazillion dollars. Nobody anywhere is going to be able to put an estimate on it other than a wild and meaningless guess, not even a personal injury lawyer.
A personal injury lawyer will pick a number based on all the details and make a demand. From then on it's subject to negotiation. If an agreement cannot be reached, a lawsuit follows and the question of damages goes to a jury.
Any settlement or award, of course, would be limited by the "per person" liability limit on the other driver's auto insurance policy.

