Alrighty here is what I got from a normail thermometer last night,
(Keep in mind this is not very accurate as I was not about to open my Wii to get the temp instid i just tuck it underneith the fans)
Standby all day
On for < 1 hour
Also keep in mind that this was a cheap Vicks thermometer but when I can afford better one I will get you more accurate temps.