E Block reached its reserve price in round 44 on Thursday and the FCC announced that it was going to six bidding rounds per day beginning on Friday, Feb. 8.
However, while D Block is probably permanently stalled below its reserve price for Auction 73 and will likely have to be reauctioned, there is still sufficient activity in the auction to expect that it will continue for as much as two more weeks, depending on whether the FCC decides to further accelerate the number of rounds per day. The following table shows the rates of convergence to full clearance over the past six and the past three rounds. These rates are consistent with an auction conclusion in the last week of February or the first week of March if previous auctions are a reasonable guide. However, there have been sufficient anomalies in auction performance in Auction 73, notably high amounts by which A and B Blocks have exceeded their reserve prices and the speed with which these prices have been obtained, which caution us not to rely too much on previous auction behaviour. The FCC has been gradually upping the number of bidding rounds per day and I expect further increases, as the agency seems inclined to press the auction to conclusion.
On the basis of these facts I would estimate at least two, perhaps three more weeks of bidding, primarily in E Block, before we see the end of Auction 73.