Should I increase my withholding exemptions for a severance check?

I'm getting a lump sum and have been told it will be taxed over a 2 week period. If I leave it where it is, I'll have over $8000 taken out for taxes. I don't plan on going back to work very soon. I was thinking of increasing it to 10, but I don't know if I should and was wondering how much that would save me in taxes.