Is bus stop Guangzhou-HK located at Landmark hotel GZ & time table

Yes, you are right. The bus GZ-HK is available at Landmark Hotel and the timetable is 05:15, 06:10, 06:40, 07:10, 07:40, 08:10, 08:40, 09:10, 09:40, 10:10, 11:10, 11:40, 12:10, 13:10, 13:40, 14:10, 15:10, 15:40, 16:10, 16:40, 17:10, 17:40, 18:25, 19:10, 19:55 and 20:40.