Probably not, files that big, its just gonna take time to reprocess files like that into a different format, and its also very processor intensive. Although over an hour seems a bit sluggish.When I try to put Mp4 videos on my zune it takes over an hour. Why is this? My computer is really fast. The files are about 600-800mb. Is there a way to use the zune software to convert the videos in the backround?