The duration (covering period) of the National Security Strategy (NSS) according to the US Code is one year.
In most cases though, the National Security Council (NSC) only publishes 1 or 2 NSSs during each Presidency.
In other states the NSS covers a period of 5 (minimum) to 10 (maximum) years.
What do you think is the preferable covering period a NSS should have?