This depends on the circumstances. If the property is for sale, there may be a lot of entries by the landlord or a realtor in order to show the property. If a landlord is conducting repairs, then there may be multiple entries.
Tenants have the right to peaceful enjoyment of their property. Tenants should not be continually disturbed by the landlord entering the unit. If a tenant feels the landlord is being unreasonable in the number of requests being made to enter, the tenant should speak to the landlord to see if the situation can be resolved. It is helpful for tenants to put their concerns in writing, in case there is a dispute in the future.
If the tenant is unable to reach a resolution with the landlord, the tenant may want to consider applying for a rent abatement or to end the tenancy on the basis that the landlord is not allowing for peaceful enjoyment of the property. These applications can be made in Provincial Court Civil or through the Residential Tenancy Dispute Resolution Service.