As I read the quote above it is saying Reg Z includes (counts) Federal Holidays for the ROR when it doesn't.
I just wanted to clarify that Reg Z excludes them from the ROR so someone would not take away any misinformation.
RESPA does not exclude Sundays and Federal Holidays in its definition of a business day with the exception found in 3500.7 for the timing of when a GFE is received when mailed in place of providing it face to face.
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The opinions expressed are mine and they are not to be taken as legal advice.