My general rule of thumb is that if the severance covers the expected time of the job search-- and allows you to represent yourself as employed during that time

My general rule of thumb is that if the severance covers the expected time of the job search-- and allows you to represent yourself as employed during that time-- you should sign the non-disparagement clause and take the package. That's typically 2-3 months at lower levels, and 6+ months at higher levels. Offering nondisparagement is almost always worth it to move on with your career intact and your income undisrupted. At 2 weeks, you should tell them to shove it. If they don't take care of you, you don't take care of them. Honestly, I wish more people did tell the truth about ex-employers who treated them badly. The "never badmouth" rule makes severance payments low, reckless firings common, and bad corporate behavior a lot more prevalent than it should be.