After the order of sale is set, items sell or close in lot-number order. We can give general pace estimates, but virtual auctions are still live human auctions and the pace depends on bidder interest.
As a rough guide, virtual auctions may average 80–100 items per hour early in the sale and 60–70 items per hour later, though actual sales can move faster or slower. Timed auctions can close faster, sometimes around 100 items per hour, which is why advance bidding is strongly recommended.
If you plan to bid in real time, monitor the auction rather than relying only on an estimated sale time.