how do I slow down the internet speed?

Hi, I am new with and android box and Kodi and was wondering if there is a way to slow down the speed that shows stream in at. I have set the internet speed as low as it will go in Kodi, I think that is 512 kbps. Now if I watch an one hour show it uses up 2 gb which I think is wrong. I am using the Kodi 16.1 rc seeing that is what came with the box.