How do you know what version of Apple tv you have?
How do I know what version of Apple tv I have and why does it take 7 hours to download a movie when I have hi speed internet?
Settings > General > About.
The first thing to check would be your internet download speed, you can do this at www.speedtest.net.
1080p HD movies require a recommended speed of 8 Mbps, 720p HD movies require a recommended speed of 6 Mbps, while SD movies require a recommended speed of 2.5 Mbps.