Looks like an interesting poll, but I don’t get why it averages across 6 days, rather than 3 or 4. Seems like by the time each daily poll in released, the information therein will be half-stale.
Your concerns about the length of each polling period are valid...however it has advantages in evening out the differences pollsters get when they poll weekends as opposed to early weekdays, etc. I think it provides a more valid sample on which to assess that particular period. But you are right it’s quickly dated.