There are an average of 250 trading days in the stock market. The calculation is as follows: There are 52 weeks a year, and markets are closed on weekends, meaning 104 days off (52 Weeks x 2 Saturdays & Sundays) + 10 to 12 national holidays. So, according to that, almost 114 to 116 days of the market is off, meaning we have nearly 250 days (365-116).