Wyeast Answers: When should I smack the pack?

Wyeast Laboratories microbiologist Greg Doss give a suggestion on when you should smack your Wyeast Activator pack.
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[@p.chuckmoralesesquire3965]

Thanks for the clarification. I get a lot of northern brewer kits from midwest supplies and it says under the title "a few days before brew day" "allow at least 3 hours for inflation" so that is kind of confusing because between a few hours VS a couple days is kind of a long time.