1 hour 21 minutes

... simply because it made a nice 9x9.

I got a new toy today - an intervalometer. I set it to take a photo every minute, got me a cup of tea, watched the news... went back upstairs 81 minutes later et voila. It does loads of other things too, I imagine this isn't the last you'll see of it.

Oh, by the way... It looks much better in animation form.