If you provide the revised GFE in person you can close on the day you provide it to the consumer.
Also, where in RESPA does it say that the borrower has to receive a revised GFE at least one day prior to closing?
Nowhere. There is no waiting period when the revised GFE is presented in person. You can literally provide it at the closing table and as long a the borrower accepts it you're good to go.
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The opinions expressed are mine and they are not to be taken as legal advice.