Definitions for "Primetime"
The time of a television network or station broadcast day typically between 8pm and 11pm.
A continuous period of time not less than 3 hours per broadcast day as designated by the station. Usually 8-11 p.m. EST, 7-10 p.m. CST, and 8-11 p.m. PST.
Between 8:00 p.m. and 11:00 p.m. EST, Monday-Saturday and 7:00 p.m. until 11:00 p.m. Sunday, during which time networks televise their most high-profile programming.