I'm not a challenger but i'll answer as if i were one.
The day don't bother me, saturday is fine if the match isn't out of the week end that's fine.
but the hour, bother me a few more
I'm french, and the France is in the timezone GMT+1.
so in france when the cogs start, it's 21h ( 9 PM ), at this moment, i'm eating, it's a annoying but i can eat before to participate.
I would prefer play during the afternoon, like 15-16h ( 3 or 4 PM ) but in american it's 10 AM. a saturday peoples want to sleep at this moment
and i think, if i were them, wake up at 10 AM would be really really annoying
so that's what i would prefer but i wouldn't ask them that ...
finally, i prefer don't change the actual organization
That was an aeron_man's allocution