Reusing yeast

[MedicineMan]

I am going to be washing and reusing my yeast from my next batch. Iv seen the post where people stored the yeast in mason jars. I was wondering when I make a starter how many mason jars worth of yeast should I use and how long does the yeast in the jars stay good for?

 

[gbrewing]

https://www.homebrewtalk.com/f163/yeast-washing-illustrated-41768/