Tennessee Code Title 2. Elections § 2-3-306

(a) Convenient voting centers shall be open for voting for a minimum of ten (10) continuous hours but no more than thirteen (13) hours. All convenient voting centers in the eastern time zone shall close at eight o'clock p.m. (8:00 p.m.), prevailing time, and convenient voting centers in the central time zone shall close at seven o'clock p.m. (7:00 p.m.) prevailing time.

(b) At least fifteen (15) days before the date of each election, the county election commission shall determine a uniform time for the opening of all convenient voting centers.