Opening Hours of Sneakers Street
Like many fashion shops in Kowloon those shops on Sneakers Street don't open until late. Expect the larger shops to open around 10:00 or 10:30 but some won't open until lunch time.
To compensate they are open very late and even if you visit after dinner you will still find most or all of the shops open as late as 10:00 at night. If you have an itch to buy some athletic shoes at 11pm then Sneakers Street Fa Yuen Street in Mong Kok is probably one of the few places in the world where you can do so!
The best times to go for actual shopping is early afternoon when everything is open but not yet too busy, but for an exciting atmosphere then later at night when the shops are all lit up is more interest.