The battery life of the XOOM is rated at 9 hours as tested by others... Another thing, the XOOM charges in half the time so you get roughly 18 hours of use for the same amount of charging time that the Apple gets you in 11 to 12 hours.

Also, going from New York to China or Australia with any stop over will leave the tablet short on power. Now remember, even the competitors are over 10 hours when all the radios are turned off so you're not going to see a huge advantage either way.