Monday to Tuesday positions settle Wednesday to Thursday, so 1 day of interest is paid/received.
Tuesday to Wednesday positions settle Thursday to Friday, so 1 day of interest is paid/received.
Wednesday to Thursday positions settle Friday to Monday, so 3 days of interest are paid/received, including weekends.
Thursday to Friday positions settle Monday to Tuesday, so 1 day of interest is paid/received.
Friday to Monday positions settle Tuesday to Wednesday, so 1 day of interest is paid/received.
ThereforeWednesdayis called Big Interest Day, the total weekly interest is the sum of seven days.