Dear me, this is the first spate of Monday Morning Missed Snipes Blues we've had for awhile! As a general thing, snipes set for Sunday afternoon and particularly Sunday evening should have a lead time of at least 20 seconds. (Sara B. from Auction Sniper Support recommends up to 30 seconds and says that even that much lead is sometimes not enough.) This is irrespective of whether the auction ends on the even hour, half-hour, or quarter-hour...it applies to any snipe on Sunday afternoon or evening. Missing a snipe because of insufficient lead time is not justification for compensation from AS, since a search of the Forum archives would have revealed a ton of warnings and information about this.
In answer to Dsallilas' question, compensation in the form of free snipes is available for missed snipes when the miss is the fault of AS. If, after clicking on "search" above and searching for "Sunday bids" (without the quotes) any of you are convinced that the usual Sunday logjam at eBay is definitely not the cause of your missed snipes, go to http://www.auctionsniper.com/freeSnipes.aspx and file for compensation.