That headline is a rule of thumb

Its not perfect.

But, generally speaking, the longer it takes the more debate there has been .... most likely about fresh easing measures

I posted on timings of announcements earlier today, here:

Q: What time is the BOJ announcement today? A: Well, it depends

There is some thought that Kuroda will delay until Hillary Clinton finishes speaking.

Hmmmm.

If so, I wish she would STFU then. :-D