Answer:
All of the day counting in Regulation E refers to a number of days following the day of the event triggering the count. So, the first business day following the day an error resolution is filed would be day one of the 10-business-day or 20-business-day period, and the first calendar day following the day of filing would be day one of the 45-day or 90-day period, as applicable.
First published on BankersOnline.com 9/24/07