Typically how long you can rent a car for depends on the inventory of the supplier. For Santiago de Cuba however, it is certainly possible to rent a car for an entire month.
View Sunnycars locations in Santiago de Cuba
Aeropuerto Santiago de Cuba
Aguilera P. de Marte
Avenida Raul Pujols Km1 1/2
Avenue Las Américas & Gnrale Cebreco
Heredia y Aguilera