@Amy203 The Superbowl doesn't last for a month, right?
There seems to be a new guest scam (several hosts have reported here that this has happened to them), whereby guests book for a month to get a discounted rate, yet have no intention of staying for a month, then tell the host some bogus story about why they have to leave after a week or 10 days, and demand a refund.
I don't know if that's why you are getting these, though. Airbnb has also been promoting long-term stays.
If you have a 5 day maximum setting, guests can't input dates on a request for a period longer than that, so these must be inquiries? If they are inquiries, just create a saved message you can shoot them saying your maximum stay is 5 days.
You might want to put something at the beginning of your listing description until this rash of requests for a month dries up- "Please note: Our maximum stay is 5 nights. We do not accept longer bookings."