It's just doing the math for you - there is no special rate for the weekly numbers. As PP said, it's 7 nights, (5 weekday nights S/M/T/W/R, 2 weekend nights F/S)
DVC stays "cost" the points per night for the nights you travel. If you cross a 'season', like from Magic to Adventure you will be "charged" the points required in each season. There in not a requirement to stay a week. You can stay 1 night or 20 nights or what ever... just add the points for each night to get you total 'cost'.
Just what it says, move to a 28 hour day. 6 days in a week.
Never enough hours in the day? Surprise, you now have 4 more!
2 day weekends are now 8 hours longer!
Hate mondays? Guess what day we get rid of?
It 's a joke. But there actually is a lot on the web about the idea.
Although I think the notion of having most of your day be in darkness one day, then light the next might mess us up a bit.