Opening days and hours of the ticket windows in SOUTH STATION and CHANGSHA railway station.

Please can you give me the following information for the opening days and times of the ticket windows in both railway stations:

1) Are the ticket windows in SOUTH STATION open 7 days of the week?
2) What time do the ticket windows open and what time do they close each day?
3) Are the opening days and hours the same for main railway station?
4) Also, at what time does the subway station open in the morning and at what time they close at night.

Thank you very much. It will be very helpful to have the above information.