I did a trial run a couple of days ago.

Set wifi to auto-search and auto-login (where I work I have 2 weak APs, the phone jumps up and down, I also walk between them a lot), left a few conversations open (Google chat), set my availability. Set bluetooth to on (visible), charged it at about 2 AM and took it to bed (wakes me up in the morning, stop looking at me like that).

09:00- 100%
11:00- coffee done, by now I had almost an hour of playing, showing off the device and playing video. Also, I tested the FM transmitter in the car, about 10 minutes of playback. 100%
12:00- A few calls, loads of chatting (Google Talk), some SMSs. Dropped to 80%
14:00- Wifi is taking its toll, Youtube showoff really eats. 60%. I started to worry a little, thinking it would be beeping off when I got home, so no more youtube. Continued chatting and wifi activity, a few snaps with the cam.
18:00- Battery down to 30-40%. No wifi at home, it was searching and trying unavailable networks. Some gaming.
20:00- Battery down to 20%
02:00- Still 20%

Couldn't get it to go into red, gave up and charged it. That's it for me, all day long with internet linked, browsing, playing, calling. If something really heavy comes up, I'll find a place to charge.

Because I don't use the device overnight (event tho it has BT and wifi scanning), I voted for 13-16 hrs, but really, it's all day.

IMO, all-day-networking Nokia target has be achieved.