If it were me, I'd grab the extra money, but I tend to have a little trouble letting go of old jobs, so I'd likely bail them out even if it were full days, so that's not necessarily the best advice for YOU.
Also, my first layoff, I made a wonderful, somewhat dramatic exit and never went back. That felt sooo good! It doesn't work so great for the dramatic exit when you keep working for them afterwards - which is more like my recent layoff. But in each case I needed a different kind of closure. The first time, everything could be wrapped up in a few hours and the dramatic exit gave me a better feeling of satisfaction. The second time I had to take months to wrap everything up and make sure it was in good hands. I don't like wasted work, and if I'd not wrapped up those loose ends a lot of my work WOULD have been wasted for sure. (It still could be, but I won't be there to witness it and I can pretend it wasn't.) So again, I get closure.
So you need to think about what, for you, will give you the best sense of closure, IMO.
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Also, my first layoff, I made a wonderful, somewhat dramatic exit and never went back. That felt sooo good! It doesn't work so great for the dramatic exit when you keep working for them afterwards - which is more like my recent layoff. But in each case I needed a different kind of closure. The first time, everything could be wrapped up in a few hours and the dramatic exit gave me a better feeling of satisfaction. The second time I had to take months to wrap everything up and make sure it was in good hands. I don't like wasted work, and if I'd not wrapped up those loose ends a lot of my work WOULD have been wasted for sure. (It still could be, but I won't be there to witness it and I can pretend it wasn't.) So again, I get closure.
So you need to think about what, for you, will give you the best sense of closure, IMO.