That number is unknown. You will just have to keep defeating him until he offers you the duel coat.
summon easy monsters and destroy the other persons shields then a direct attack
Go to your room and then keep going right until you get to do timed duels. Hope this helps :)
A duel economy is a concept originally by Julius Herman Boeke, in which there are two different economic systems within one country. This is more common in less developed countries, where one system...