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