How long does it take for the room attendant in Hanting Hotel to go from junior to intermediate?

It's hard to say the time from junior title to intermediate title. You have to take the evaluation or examination to get the intermediate title, depending on your ability and level.

Room attendant mainly refers to the service personnel who provide cleaning services for the rooms of hotels or hotels and help the guests live. Its main tasks include: cleaning and checking guest rooms, replenishing supplies, providing services for guests, using and maintaining cleaning supplies, checking guests' belongings and valuables in guest rooms, and ensuring the safety of work areas.