Washing yeast

A couple of questions that I haven't seen touched on in the sticky...(hope I didn't just miss it).

I washed yeast from a trippel primary that was sitting for nine weeks...Any problem with waiting this long or longer?

After racking to keg and bottling bucket(2 seperate brews), I let is sit for 30 min or so before adding cold water. I it a more immediate approach?

I sanitized a gallon jar, and pulled water straight from tap(good tap water), is the boiling on the sticky just good sanitation practices?

How do I know if my yeast is viable?

I wouldn't wash the yeast from a big beer like a trippel - the yeast from a big beer is stressed.

And I also wouldn't use non-boiled water, for sanitation reasons.