'Deathly Hallows - Part 2' passes the $900 million mark at box office - when will it hit $1 billion?

Unsurprisingly, Harry Potter and the Deathly Hallows - Part 2 is doing extremely well at the box office.

Its latest record is the race to $900 million globally.  The film reached that landmark in just 15 days - 3 days faster than the previous record holder Avatar did.

So, when will it hit $1 billion?  No one has an exact estimate, but we'd guess no later than the next week or two.

When do you think it will hit the big number?  And how high will it go?