Well for quite a while now I mine 18hrs a day, since in the middle of the day it costs me around 40c/kWhr so that'd never happen
Currently it's only one Avalon6 (I can only really run 2 due to power limitations) so around 3.6THs 3/4 of the day.
It was 2 of them since December but recently I fried half of one due to weird circumstances and it's now upstairs and too loud to run so it's off until I either swap in a quieter fan from something else or just leave it off. It's not very loud, but loud enough to not want it on during the night.
You can of course see my hash rate on the list with everyone else

Edit: as clgrissom3 said