@Judi48
If you set a minimum stay for a specific time period, you need to realize that time period does not act as a totally isolated period. Settings like maximum stay are only active on the choosen check-in date within the time period. If somebody chooses a check-in date before the specific time period, they can book into the time period without restrictions. It means you have to make additional settings to prevent this, like limiting check-in days etc..
The most rigid (but effective) way is to (temporary) block 1 night just before the specific time period.