Cheryl, I used to use this stuff exclusively because it's convenient. I know the stock solution has good storage life. I don't remember reading on the bottle that the working solutionhad a precariously short life. I never let it set though. If it was me I'd stir it up and go for it. If I was a pro with valuable negs I'd prolly mix up some new stuff, then perform a test on disposable negs. If I remember right this stuff was pretty cheap at 1:4. Let us know what happens.
The Rat

Oh yeah, luv the avatar. Can I get an 8X10 glossy?