According to incomplete statistics, there are several Beijing-Shenzhen seafood markets in Beijing. The opening hours of some of these markets are as follows:

1. Beijing Jingshen Seafood Shopping Plaza (Haidian Store): Business hours are 9:00-20:00 from Monday to Friday, and 8:00-20:30 on weekends and holidays.

2. Beijing Daxing Jingshen Seafood Market: It opens at 7:30 every morning, with flexible business hours at night, which can be adjusted according to seasons and conditions.

3. Beijing Fengtai Jingshen Seafood Market: Business hours are from 7: 00 am to 8:00 pm every day.

It should be noted that the business hours of different seafood markets may be different. It is recommended that you confirm the relevant information in advance before going to avoid a trip in vain. In addition, because there are many people in the seafood market, please pay attention to the order rules in the market to ensure your safety and hygiene.