Usually, the Huaqiangbei market consists of several markets with different operating hours
You can generally operate between 9 am to 6 pm each day. Some malls are open late until 10:30 pm.

It is inevitable to face scams in such giant markets. So, you should be beyond careful while making a purchase.
You should check for original manufacturers or check for this business license.
Before ordering, ask for sample verification.
Also, consider that they sell products that comply with the respective country’s quality standards.