Normal Stock Exchange Market Hours:

Monday - Friday
9:30 a.m. to 4:00 p.m.- (New York / EST)

After hours market hours are:
4:00 p.m. to 6:30 p.m. ET. (New York / EST)

Pre market trading session is:
8:00 a.m. to 9:30 a.m. ET. (New York / EST)