Why does my iMovie not upload to YouTube from my iPod touch 4th generation?t?

I go through the motions of uploading the movie. It exports perfectly fine. But when it says it is "Uploading to YouTube", it shows the bar fully loaded but continues to say " Uploading to YouTube". I left the room for this process and return 3 hours later to find no change. The move is 4 minutes long but my other 2 minute or so movies upload just fine.