My take on the 24 hours, which could be wrong, is that active bidding could be going beyond 24 hours as 2 or 3 owners make increasing bids, and a player not getting bids for 24 hours is the property of the high bidder. If that is the case, then there will be staggered close times on different players, which would create different start time on subsequent players.
An extreme example....owner 1 begins an auction on Dave Chalk at $.75K, and no one else bids, so 24 hours later it's over,
Owner 2 opens with Frisch at $4M, and there are 4 owners making ever increasing bids. We stop that active auction 24 hours after the start, or 24 hours after the last bid?