I have been told by a white labs rep that viability in a pure pitch pack after six months stored in a fridge is 75%. That might be optimistic, but your viability might still be better than 40%.
Also, white labs publishes qc data including cell counts for each pack of yeast. You will need the lot numbers from your packs of yeast. They may have started off with way more or less than that 100 billion cells.
https://www.yeastman.com/Login/Public/Report/PublicLabQCResult.aspx
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I have still not used this yeast.... as life and kids get in the way of my brewing....
So the report shows
Results from 2 lots are are -
For Lot #1034385
QC Release Date: 1/25/2017
Homebrew PurePitch® Best Before: 7/24/2017
WLP940 Cell Counting 2.83e9 adiaz
2 packages
For Lot #1034606
QC Release Date: 2/1/2017
Homebrew PurePitch® Best Before: 7/31/2017
WLP940 Cell Counting 2.83e9 adiaz
I have 1 package of this.
I still make a 2 gallon starter?
Viability is ?
thanks Kevin