Math works out for a typical WL vial.
Minimum viable 180B per satchet, average WL vial for most strains* is about 80-90B. 180/80=2.25.
*Flocculation seems to be the biggest variable for this. Low flocc strains have an average of ~65-75B, and can be as low as 30B according to the QC reports I pulled from yeastman last winter.