When I have measured it I get around 12-16 hours depending on the game time, but I usually recharge around 40%. Last week I did what Apple recommends to charge completely then use the iPad until the battery was depleted and I was forced to recharge.
I charged to 100% on Thursday and removed the charger at 3PM. I used the iPad for games (I played a lot of Infinity Blade), Netflix, browsing, reading on Kindle app, Flipboard, and NYT app. In all I used the iPad a minimum of 5 hours per day but much more on Saterday. I also bought several of the EA games that were on sale and played those.
The iPad finally forced me to shutdown and recharge around 4AM Monday, or 85 hours after the charge. It took about 6 hours to fully charge back up.
I probably used the iPad for a total of 18 hours at that point.
I charged to 100% on Thursday and removed the charger at 3PM. I used the iPad for games (I played a lot of Infinity Blade), Netflix, browsing, reading on Kindle app, Flipboard, and NYT app. In all I used the iPad a minimum of 5 hours per day but much more on Saterday. I also bought several of the EA games that were on sale and played those.
The iPad finally forced me to shutdown and recharge around 4AM Monday, or 85 hours after the charge. It took about 6 hours to fully charge back up.
I probably used the iPad for a total of 18 hours at that point.