A lot of it has to do with bandwidth. If you're on a good, strong internet connection, it shouldn't take long, but if you're on a network with a lot of users (cell, some school networks, etc), it will take longer. I'm not familiar with this app, but I know that I had similar issues with others. A trick I found useful (but doesn't work for all apps) is to condense the video, if it's an option. It won't be the highest quality, necessarily, but it shaves a lot of time uploading. Good luck!