For items under some amount $X, you could have a hard cutoff. If the bid wasn't above $X already by the deadline, the seller probably wasn't giving up a lot by having the hard ending time.
For items with bids over $X, you could pretty quickly go lot-by-lot in a chat feature (I don't think the one here works, but there are plenty of solutions) and the buyer/seller connect via PM afterwards.
Might be entertaining to try as a one-off.
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