thought it was only allowed there for 72 hours every 30 days

Boats, trailers, RV's and other recreational vehciles can only be on the street for 72 hours every 30 days.

Please check with your HOA board, as there is likely a deed restriciton in place that prohibits boats and other recreational vehicles from being stored at residences. If this is the case, your HOA board can enforce this restriction and require the resident to move the boat.