What constitutes a view?

Hey all,

Apologies if this has been answered before but I didn't see it in any recent threads.

What counts as a view in Youtube's eyes? Everyone is saying that bots don't work anymore, so a view has to be more than a unique IP loading the page. The only thing I can figure is that the amount of time a visitor stays on the page has to be the deciding factor. So what is the magic number when a view counts as a view?

What do you think?

Bots are still working, you just have to be using the latest versions.

I think its 10 seconds but I don't know for sure..