If I use everything (Magellan GPS, TrueSpeed or VCMS in the car, email, web browsing,
Sky.fm streaming radio, BlackBerry news, games, etc.) I'll get about 6 hours before it's almost at 0% charge.
If I'm at around 82% charge and I leave Antair NightStand on all-night (clock always on) I'll be at around 5% charge in the morning. The playbook works great as a clock at night, nice big display
I must be fortunate or don't use the Playbook much. Either way, my PB gets charged every day or every other day. I control bluetooth usage though and GPS is on as needed.
today was the first day with my pb. my friend and i drove from socal to norcal. pb was off the charger at 12pm, bridged to my bb most of the day (90%) wifi on, brightness at 30%. he used it for 5 hours straight at 100% brightness and then i used it on and off for 2 hours at 30%. Its the first charge and im at 1% right now. Not bad for the first day I'd say!
I go to bed watching Crackle. For some reason the screen stays on all night (you'd think it would automatically turn off when it's done playing). I go to bed at 100%, but I wake up to it at 3 or 4%. So, streaming something online, I get about 6.5 hours.