2 hours is the maximum setting for the "as collected" NetFlow stats. That does not mean that you only can see the last 2 hours, that is just where data roll up starts. The as collected NetFlow data takes up a lot of space so if you were to increase it that would eat up your 50G quickly.
Please forgive the newbie question but how do i increase the netflow statistics time window? so i get to see the last let´s say 4 hours.
Thanks for your response.