The plan prepared by the Secretary shall become effective, and he shall take immediate action to implement the plan for the use or distribution of such judgment funds, at the end of the sixty-day period (excluding days on which either the House of Representatives or the Senate is not in session because of an adjournment of more than three calendar days to a day certain) beginning on the day such plan is submitted to the Congress, unless during such sixty-day period a joint resolution is enacted disapproving such plans.