http://www.orht.gov.on.ca/userfiles/HTML/nts_3_7968_1.html
If a tenant wants to leave
A tenant must tell their landlord in writing if they plan to move out, by giving a Tenant’s Notice to Terminate the tenancy. The last day the tenant plans to occupy the unit is called the termination date.
A daily or weekly tenant must give at least 28 days notice. For a weekly tenant, the termination date must be the end of a weekly rent period.
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A monthly tenant must give at least 60 days notice, with the termination date being the final day of a monthly rent period.
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A tenant with a lease must also give at least 60 days notice. The termination date cannot be earlier than the final day of the lease.
A tenant and landlord can agree to end a lease early, but this should be in writing. In this situation, a notice of termination does not have to be given by either the landlord or tenant.
A tenant in a care home can end a lease early, with at least 30 days notice in writing to the landlord.