the uplpoad speed doesn't depend that much on the lenght of the video but on the size of it and the upload speed. how big is your video in megabytes and how fast is the upstream of your internet connection?
usually your ISP tells you a maximum speed like 16mbit/s (or 16000kbit/s). Divide that number by 8 and you know the megabyte per second that you can send or receive.
an example.
I have 16mbit/s downstream and 1024kbit/s upstream. that means that I can download 2 megabytes per second and upload 128kilobytes per second. those are all very theoretical values, because your "real" speed depends much on the overall network load. but theoretically I can download a 20 megabyte big file in ~10 seconds and upload it in ~2,6 minutes.
that means:
if you like to fasten your upload speed, you need to make the file smaller (resize it to a smaller megabyte number) or increase your internet upload speed... or both
