Ellen and Isaac have a timeshare near the Grand Canyon. They'll be able to use it for two weeks every September, for the next eight years. What type of timeshare is this?

This is called timeshare since the property does not belong to it as if they are buying a property with more people, in this case they rented in summer, then the house is available in summer for the next eight years, but finishing the summer the house can already belong to other staff in the same way for a certain time

The timeshare regime consists in the provision of the right to use and enjoy a property (also called multipurpose), usually some type of holiday accommodation, during a certain period in the contract.