How long would it take to complete Halo 1 and 2 campaign on each difficulty?

[Matt]

Hi, massive Halo fan however never played 1 and 2 campaign. How long would it take on each difficulty to complete both of them?

 

[Dale]

Lets see...
10 Campaign maps in halo one =8/11 hours depending on difficulty (8 easy , 11 legendary)
13 on halo 2 = 10/14 hours depending on difficulty

14 + 11 = 25

So around 1 day and 1 hours non stop