Stiftelsen Akershus festning for Kunst og Kultur

The Akershus Castle has an inner keep that's open different hours from the castle grounds. The grounds are open 6am-9pm and those are the hours on Google. The keep (including the church where the king is buried) is open during the summer 10am-4pm and only noon till 4 on Sundays. In the winter it's open only on the weekends. This information should be widely distributed but isn't. I only know because i talked to the visitor center