readAttributeTotalOperationalHours(completionHandler:)
Declaration
func readAttributeTotalOperationalHours(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributeTotalOperationalHours() async throws -> NSNumberfunc readAttributeTotalOperationalHours(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributeTotalOperationalHours() async throws -> NSNumber