7 Days

It depends...how does he do it? Does he destroy the ANV (say the landing succeeds as planned at Etham's Landing and cuts off the ANV) or does he capture Richmond quickly before the ANV can redeploy to oppose his advance?

The former basically ends the war in the VA front and drastically shortens the war period. The latter depends on if he can force an engagement yet avoid getting himself isolated from supply lines and besieged himself!
 
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