In this one, the last time I did pay attention to it (which was shortly after the 48 hours but then I got distracted and forgot again), it had the same number of votes as when I did finally close that round. In fact, for the most part, it seems the majority of votes come in within the first 6-8 hours or so. A week would just be overkill - as you might've seen further back, I even considered shortening the rounds for this reason.
Anyway, my votes for this round were:
Taxing 21 - It's a somewhat unique puzzle, and the 100% requirement adds a significant amount of challenge to it.
Mayhem 6 - Another one I can't really put a reason to.
Mayhem 18 - Pretty much what Minimac said.
By the way, I'm making a slight change to the qualifying levels requirements from the 2nd round onwards (to keep it fair, it won't affect later sets of the first round; I also won't apply the changed rule to the 1st round in the ONML/etc voteoffs): For the 3rd place (or below) levels to qualify, they must have at least half as many votes as the 1st place levels, instead of simply having to have at least one vote. This is in addition to the existing rules. For example, if the 1st place level got 10 votes, and the limit isn't reached after 2nd place, then if the 3rd place levels have 4 votes they won't qualify, but if they have 5 then they will.