had the N9 in the "NOKIA" bag sitting in a corner for a few days as well as carrying it in my coat a couple times with 3G (when available).
run little over 4 days simply with a "empty" standby screen (i have it in its black leather pouch when not in use) and being online (mail, social sites & some Skyping)
after two days +/- i had 11 mAh in idle (& most of the time then, was the 1st time i used it in that charge )
missed to check power consumption before it went out, though

a couple charges back (was mostly at home & used WLAN automatically) it was down to 6 mAh idle but i didn't bother checking how long it run that way) used a Bluetooth keyboard as well, thus that probably burnt the battery down quite a bit