timeUnit property
The time unit in which the frequency cap will be applied.
Required when unlimited is false.
Possible string values are:
- "TIME_UNIT_UNSPECIFIED" : Time unit value is not specified or is unknown in this version.
 - "TIME_UNIT_LIFETIME" : The frequency cap will be applied to the whole life time of the line item.
 - "TIME_UNIT_MONTHS" : The frequency cap will be applied to a number of months.
 - "TIME_UNIT_WEEKS" : The frequency cap will be applied to a number of weeks.
 - "TIME_UNIT_DAYS" : The frequency cap will be applied to a number of days.
 - "TIME_UNIT_HOURS" : The frequency cap will be applied to a number of hours.
 - "TIME_UNIT_MINUTES" : The frequency cap will be applied to a number of minutes.
 
Implementation
core.String? timeUnit;