Hello @Maki9,
Go to your calendar and click on "Availability settings".
Then click on "Reservation preferences".
You'll then see a "Add a requirement for seasons or weekends" link under the minimum and maximum stay boxes. Click on this link.
Then click on the "During" box and select the option you want. You can select seasons, specific dates, Fridays & Saturdays etc.
When you've selected the dates then set the minimum stay.
You can then click on "Add another requirement" to set the minimum for a different period.
Steve.