8 mos is way too long unless they are trying to get much more than the NADA value and are refusing to agree on the adjustors settlement.
When you're not at fault, in some states, you can have your own insurance pay the claim and they will go to the reckless driver's insurance to get reimbursed sometimes using their own lawyers. That's why it's important to call your own insurance company as well as contact the offending parties insurance adjustor, rather than just waiting for them to send a check.