In section auction parameters, system allow to edit following fields:
Auction direction - two directions (reverse or sales) are available for selection. The differences between them are described on the page Creating a new auction.
Reference value - allows you to specify the acceptable value of an auction item.
Call value - allows you to specify the price at which the auction will start.
Final value - allows to specify the value at which the auction will end.
Value change by - allows you to specify the time after which the value will change.
Increment(amount) - allows you to set the amount by which the starting value of the auction will increase or decrease (depending on the direction of the auction).
Info
Both Final value and Value change by, have a direct impact on the auction end date.
Also check: