The minimum is 30 days before the change takes effect. Anything longer than that is gravy as far as the customer is concerned.
Using account-specific statement notices can work for you, too, as long as you make sure the last statement cycle to get the notice gets it at least 30 days before your effective date.
And of course, you have to be specific with the date the change will take effect.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8