[flbrewer]

I'm considering trying this for the first time with some WLP001 I've just recently pitched. How hard is this? How long can I store the yeast?

[gmac]

For the non-scientific assumption, I've re-pitched many times and I've saved it for a couple weeks and pitched it with good results.  I usually run a flame around the mouth of the carboy to kill anything that may be there and then just dump it into a sanitized growler.

After a couple weeks, I've "woken" it up with some wort and pitched it.  But that's by dumping off the clear beer that has gathered on top and adding a cup or two of chilled wort from the boil that was going that day and then pitched a few hours later. 

After a month or so, I've put it on a stir plate and started it up again like I would from a vial.