When is an auction extended?

Any successful bid placed within the last two minutes of an auction will extend the auction by two minutes. An auction can be extended multiple times, until there have been two minutes without bidding activity. The only exception to this rule occurs when the high bidder in an auction increases his maximum bid amount in the final two minutes of an auction. Should this occur, the bid amount will not change and the auction will not be extended until another bidder places a successful bid.