Tennessee Code Title 2. Elections § 2-6-103

(a)(1) The county election commission office or another polling place appropriately designated by the county election commission shall be open a minimum of three (3) consecutive hours each weekday including Saturdays between the hours of eight o'clock a.m. (8:00 a.m.) and six o'clock p.m. (6:00 p.m.) prevailing time during the period provided to apply to vote early. For a municipality with a population of less than five thousand (5,000), according to the 1990 federal census or any subsequent federal census, the municipal governing body may determine the Saturday schedule of early voting for municipal elections.

(2) If the proper notice under subsection (c) is made, a county election commission may close its office on a state holiday during the period established for early voting.

(b)(1) On at least three (3) days during the early voting period for those offices listed in § 2-13-202, or for any state or federal election, the county election commission office shall remain open between four-thirty p.m. (4:30 p.m.) and seven o'clock p.m. (7:00 p.m.), and on at least one (1) Saturday during the same period the office shall be open from eight o'clock a.m. (8:00 a.m.) to four o'clock p.m. (4:00 p.m.). The county election commission shall determine the appropriate dates for both late and regular hours at the commission office. This subsection (b) shall apply only to those counties with a population in excess of one hundred fifty thousand (150,000), according to the 1970 census.

(2) In counties affected by this subsection (b), this subsection (b) shall also apply to municipal elections for the principal municipality of the county. For such municipal elections, the municipal governing body and the county election commission shall jointly determine the appropriate dates for additional hours. The municipality shall be responsible for the costs of such additional hours.