shock: "thats what i thought i remembered , thanks Yogi"
Just to clarify -- I believe only Day use motor permits run on the Saturday-Sunday time frame. When you reserve a day motor permit you are entitled to use it on the given lake for any one day within that 7-day time frame. Same as other permits, you have to pick up either on the day of or the day before.
Overnight Motor permits work more like overnight paddle permits. You reserve the permit for a specific day of entry and it's only good to enter on that specific date, no flexibility.
I'm sure someone will chime in if I'm incorrect on any of the above.