Optionalend_the end date per campaign. please kindly note that if it's no limit, so you don't need pass anything and if it's unlimited, the end time would return 0
Optionalstart_The start date for each campaign. please kindly note that if this campaign is no end date, please pass today's date as the start date
GetProductLevelCampaignSettingInfoCampaignDuration sub-interface for GetProductLevelCampaignSettingInfoCommonInfo