How many gb in a 2hr movie?

it just depends on how much movement is going on, for example if there is an explosion every 5 minets its going to be alot but most of the time it will be about 1.5 gigabytes

Slightly off. A film I made that was 1 hour and 7 minutes in length was 11 Gigabytes. So a 2 hour film would be from 15 Gigabytes to 22ish Gigabytes.