reusing yeast

[Cadbury]

G'Day Men,
I have information regarding collecting the left over yeast and using it again, but can somebody tell me, after I collect it and wash it, how long will it keep in the fridge?
Cadbury

[Ed]

I store yeast under distilled water for months. If storing under beer, I would reuse within weeks. If you are referring to acid washing, I think it may be best to do so after storing but before using again.

Cheers, Ed