I got every day about 10 to 12 hours, all on, wifi on 10, normal use, videos over upnp, music, chat, some phonecalls, backlight full (brilliant display, so i want to have all of it). But still not enough. My old N73 had about 3 to 5 days, also 3G, video streaming, and so on ...
I will try a standby test with all off, no activities, no phonecalls, ... just to get the real standbytime.