I don't know. As of right now, I know it takes exactly 38 of the 12-red scrip items to cap weekly. I'm guaranteed two from each node (BTN and MIN), and I can get up to four.
That's at most five hours a week of waiting, with thirty-six minutes in between each node for me to do whatever (which is a lot actually to do...stuff. Not enough for a dungeon queue but maybe go primal farming with friends? Yes). If RNG really really loves me then it's only about three hours of standing around doing nothing.

With hidden nodes I HAVE to be mining and I may or may not get those items... I hate that. I actually like this system but I seem to be alone so... that's okay.