airtime
noun [ U ] uk/ˈeə.taɪm/ us/ˈer.taɪm/
（广播或电视节目的）播出时间（长度）
(the amount of) broadcasting time that someone or something has on television or radio
The smaller political parties are campaigning to be allowed free airtime before general elections. 规模较小的政党正竭力争取大选之前免费在广播电视上宣传其政见的时间。
Compare: airplay