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A CRA is not required to provide a decision on the dispute witin 30 days. They are requried to complete their reinvestigation within 30 days if the consumer has not sent any additional info during the reinvestigation period, and 45 days if the consumer has sent additonal info.
They then have another 5 business days, which can be up to 8 additional days if there is both a holiday and an intervening weekend, to mail the Notice of Results of Reinvestigation. If mailed, then mailing time as added in.
It is thus common for a consumer not to get the Notice of Results until 45'ish days after filing of the dispute.