What are the landlord rights in visiting the rented property with prospective buyers?

Hello

We have given a legal notary notice of eviction to our tenant as we intend to sell our property.

Viewings are required and we always give a min of 2-hour notice for viewing but our tenant is being difficult and restricting the time bands to unrealistically short periods, no weekends, no evenings... etc.

It's very difficult to organize a viewing. What are our rights?