Anti-snipe extension
A rule that auto-extends an auction's close by a few minutes when a bid lands in the final window. Prevents last-second outsider bids from winning by surprise.
The pattern
Every bid in the final 5-10 minutes pushes the close 5 minutes further. The auction ends only when the extension window expires with no new bid.
Cap
Most platforms cap the total extensions to prevent an auction running indefinitely. Deepnom uses SiteSettings.auction_max_extensions for the ceiling.