Conn. Gen. Stat. § 47a-15a
If rent is unpaid when due and the tenant fails to pay rent within nine days thereafter or, in the case of a one-week tenancy, within four days thereafter, the landlord may terminate the rental agreement in accordance with the provisions of sections 47a-23 to 47a-23b, inclusive.
(P.A. 79-571, S. 36; P.A. 89-254, S. 5.)
History: P.A. 89-254 provided for a four-day grace period in the case of a one-week tenancy.