1. Every time economic data is released, such as the American non-agricultural data at the beginning of each month, the Federal Reserve's interest rate meeting, and the release time of national economic data at the beginning and end of each quarter.
2. Large monthly meetings of financial markets, such as the Federal Reserve's interest rate decision and the central bank's policy meeting.
3. Before and during the Spring Festival every year.
4. Release time of non-farm employment data in the United States.
5. When some important political events occur, such as Britain's withdrawal from the EU and geopolitical conflicts.
However, it should be noted that the fluctuation of silver price in the market is the result of many factors, including global economic situation, inflation, political stability, central bank's monetary policy, geopolitical risks and so on. Therefore, the specific minimum time needs to be judged according to market conditions and professional analysis.