for me Happy Hour is from 9-11am. Though you need to install some Megamanager. Though even without the downloading/uploading is faster in that Happy Hour.
I notice that it uploaded files in just mere seconds as well. Though I didnt upload big files, but up to 10mb and it uploaded them in ten secons O_o
Im regular, and dont have the Megamanager, I dunno what they are doing but its great :lol:
Dunno about the downloading though, as our internet connection is 90% worse than 2 months ago (suddenly happened oO). Though when it was still good, it only took me up to 5 minutes for 150mb.