I unplugged my N5 this morning at around 07.00, it's now 16.30 and I'm on 80%. Did some web browsing on the train into work, have been messaging on and off all day. Lowest I've seen on a weekday for me was about 40% by the time I go to sleep.

Admittedly I tried some games on Sunday (Real Racing 3 and PvZ2) and the battery drained much faster, but the same happens on my ipad mini so it wasn't unexpected.