I've been brewing for over a year now and recently I racked onto a previous yeast cake of Wyeast 1272. I haven't attempted yeast washing yet, but plan on it.
My question is: how many times can you rack on top of a cake before the yeast are tired of working? If you wash the yeast does it stay active for more batches?
Keg 1: Coal Miner's Daugter Porter
Keg 2: Red October
Keg 3: Hopsolutely
Bottled: 1 Vienna Lagers; Erins Irish Red; Pils, Christmas Doppel, Addy's Amber Ale(competition brew), Mayden Voyage Blonde Ale
Future: Something Belgian, ESB