Your lender was misinformed, or heard it wrong.
The initial 7 Business Days is from when the disclosures are "Delivered" = that means the day they were mailed out or given in person.
For re-disclosure there is the 3 Business Days from the day the consumer "Receives" the redisclosures. and Receives the disclosures means if they were mailed = you must wait 3 Bus Days to assume the consumer Received them & then the 3 Business Days from receipt.
Not to blow my own horn - but the Reg Z / MDIA timing calculator in the tools section could be helpful to you.
Click here