Hosts beware! A serious bug exists in the "Rule Sets" for the multicalendar.
Here is the issue:
1. You set the rule for minimum 5 days for dates March 1 to March 31.
2. Guest tries to search for 6 days or more and your listing does not appear. In fact only searches for exactly 5 nights appear and even if the guest finds your listing through a direct link they still arent able to book more than 5 nights!
I have mentioned it to AirBnB months ago and they just stopped replying to my thread.