Pearl Harbor was bombed on December 7th. My father was drafted the next month and inducted into the Army on Feb 12th. That's a space of only 67 days.
Today marks about the 35th day since Congress convened for its current term. And its esteemed members are still yakking away about a non-binding resolution on Iraq. So to answer my own question, I don't think the country could do anything important in 67 days but somehow it did it way back in 1941-1942.