Severance agreement arrived, need a second opinion - 13 months and counting

My manager said the package is final, but the letter gives me time to review. I worked as an accountant before this. It includes health coverage for a couple of months. Did anyone negotiate and succeed?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

I asked for two more weeks and a neutral reference. They agreed to the reference and added a week.