There are no official opening hours for the public. Nevertheless, you can take a glass escalator up to the 52 m high atrium that is used as a counter area.
Wikipedia https://ko.wikipedia.org/wiki/HSBC_홍콩_본점_빌딩
주소 1 Queen's Road Central, Central, Hong Kong
좌표 22°16'48.866" N 114°9'34.273" E