Severance offer, what should I ask for? - 10 months and counting

I was offered 6 weeks of severance after 6 years as a software tester, and I have a few days to sign. There are 6 people counting on me, so I am trying to be careful. There is a non-disparagement clause. Should I see a lawyer?

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