Beyond the standard 9:30 AM to 4:00 PM, many brokers offer pre-market trading (often starting as early as 4:00 AM) and after-hours sessions (which can run until 8:00 PM), though the available hours and liquidity vary widely. It's always a good idea to check with your broker, as not all support these extended sessions and the trading conditions can differ. Also, keep in mind that NYSE holidays and early closes (like on the day before a holiday) are announced in advance—double-checking the official schedule can help avoid any surprises.