A 2 hour long movie is around 2 GB in data size but if the 2 hour long movie is a higher quality it may be as large as 4 to 6 GB of data.
Downloading a 2 GB 2 hour long movie may take as long as 4 to 5 hours or as little as 30 minutes to an hour depending on your download speed of your internet.
If your internet download speed is 1 MB then it may take from 4 to 5 hours to download the 2 hour movie and for a 10 MB download speed it might download in 30 minutes to an hour depending on the data size of the movie.
Of course if you have really fast internet then that 2 hour movie may download in as little as a few minutes.