I have not used window movie maker, but in your export options you should lower the resolution to 480p(the max resolution you have on youtube). Otherwise, find a faster internet connection. Youtube conversion is not exactly speedy, even if your file is as small as possible.
When in doubt, use the time like your code is compiling
also, try to not upload in wide screen if your not going to use the full 16:9. now that could be an issue with the file that was exported from windows movie maker.