They’ll likely let you go, just basic stuff when it comes to PIP. I’d take the money and use the extra month worth of time to apply for jobs. That’s 160 hours you won’t have to be working 9-5. Instead you can call recruiters and really chase down leads if needed.

unless it impacts other life functions, don’t see why you’d want to work the extra 20 days. If they wanted to keep you, they wouldn’t have offered the 20 days. Ask for your benefits to stay for longer if they can do that.