I think he's been shooting it for about a year now. It's probably taking so long because he's doing multiple projects simultaneously.
He's been shooting it since 2011 on and off.
Thanks for the correction. I should never trust my own memory over Google.
Are you being sarcastic? I can't tell (because The Internet.)
That's because he doesn't show his work until it's finished. Even on his scripted features no one working with him knows what exactly he's doing. No real script. Honestly, for a double feature $6 million is not that much compared to what is commonly spent on a film these days.
I didn't see "Tree of Life." From where I am standing, that appears to be a good thing.