Should I negotiate my severance?, production planner here

I was offered 4 weeks of severance after 4 years as a production planner, and I have a few days to sign. I would rather hear the honest version than the polite one. I do not want to leave money on the table. What did you ask for?

Keep everything in writing and save the confirmation numbers. It saved me later.

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