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JudgeDred2I guess common sense would indicate that staggered times would be best. The main reason (and this is very sound) is that ending the auctions at the same time may not allow the bidders to put there best bid forward on all lots because of economic reasons (possibly winning all of the lots and not having the resources to pay for all of the lots).
A staggered ending would allow bidders to concentrate on the remaining cards if they happen to "not win" the "earlier" lots. In some cases it might even turn into a better bidding scenario for the seller for the last few items.
Thanks for the input!