This was posted by Sniper Sara B. (AS support) on 4/23/03 at 10:25 AM:
The problem is eBays 10 cent feature for sellers listing items that lets the schedule their start time. It causes tens of thousands of listings to all end at exactly on the hour and half hour etc. eBay becomes clogged during those times. For all intents eBay is unavailable at those times. They are flooded by buyers resfreshing their screens to either snipe or see if they won, and by sellers to see how much their items sold for and so they can email the winners etc.
Additionally, this appears to have an impact on auctions that end exactly on the quarter hour. That hasn't been confirmed by AS, but some snipes haven't been placed for these auctions.
The recommendation is 20 to 30 seconds.
CEST (Central European Summer Time)