Earn a 20% bonus on your registered Dunkin' Donuts Card for each single Auto Recharge occurrence of $25.00 or more when you use any American Express Card to set up an Auto Recharge account. Promotion is valid through March 31, 2010, 11:59:59 PM ET. To be eligible for the bonus, set-up auto recharge on your Dunkin' Donuts Card online at DunkinDonuts.com using any American Express Card. Each 20% bonus will be loaded directly onto the registered Dunkin' Donuts Card with the Auto-Recharge account. Please allow 45 business days from the time the bonus is earned for it to be credited to the registered Dunkin' Donuts Card. Auto-recharges of less than $25 will not be eligible for the 20% bonus.