For most travelers, 4 to 5 days are enough to visit Hong Kong comfortably. Hong Kong is compact, well-connected by public transport, and easy to explore compared to larger countries.
If you have 2 days, you can see the main highlights like Victoria Peak, Tsim Sha Tsui, the Star Ferry, Central, Mong Kok, and the night skyline. However, the trip will feel fast.
If you have 3 days, you can enjoy a good short trip. You can explore Hong Kong Island, Kowloon, markets, temples, local food areas, and one scenic viewpoint.
If you have 4 to 5 days, you can travel at a more relaxed pace. You can visit Victoria Peak, Big Buddha, Lantau Island, Tsim Sha Tsui, Mong Kok, Disneyland, Ocean Park, and nearby islands.
If you have 6 to 7 days, you can explore Hong Kong more deeply. You can include hiking trails, beaches, fishing villages, museums, shopping districts, and day trips to nearby areas.
So, for a first-time visit, 3 days is a good minimum, while 4 to 5 days is ideal for a comfortable Hong Kong travel experience.