noun
prime time; peak TV viewing hours
A broadcasting and advertising term for the time slot when television or other media audiences are especially large; ゴールデンタイム is a common Japanese near-equivalent.
そのドラマはプライムタイムに放送されている。
That drama is broadcast in prime time.
プライムタイムの広告枠は料金が高い。
Prime-time advertising slots are expensive.