It is an average of the highest 39 paid weeks during the last 52 weeks of employment. The minimum death benefit is equal to 50% of the state average weekly wage in the year of injury. Payments continue for a maximum of 500 weeks, and it is tax free money.

So roughly 5 years salary, at least in Michigan.

https://www.workerscomplawyerhelp.com/blog/2021/12/workplace-death/