. Scheduled day or period of a radio or television broadcast, identified by the beginning time and duration.
2. Duration (usually in seconds) of the broadcast of a commercial the time slot for which the advertiser is billed.
3. Duration for which a cell phone call lasts, measured in minutes or seconds depending on the type of service (analog or digital) or service provider. If ‘calling party pays’ (CPP) scheme is applicable then only the caller pays, otherwise both the caller and the receiver pay.