79 days

I didn't remember that terror of losing Coke lasted for 79 days. Here's the important quote from the text:

Company leaders knew the new formula for Coke had scored well in blind taste tests and expected the initial uproar to subside once people had sampled the product. But they had not anticipated the depth of the consumer loyalty to a brand that has been virtually unchanged for generations. Stung by increasingly angry and vocal critics, on July 11, 1985, exactly 79 days after the new version had been introduced, the Company announced the return of the original formula, renamed Coca-Cola classic.

And there was much rejoicing in the streets.