According to the international banks practices, overnight fee is calculated for 7 days in a week. Foreign Exchange, Gold, and Crude Oil transactions are settled after 2 trading days (Wednesday) ( T +2 ). On Monday, Tuesday, Thursday, and Friday, 1 day of overnight fee is charged. On Wednesday, the overnight fee for trading position carry forward is being charge 3 days of interest to cover on weekend charges.
For indices, Monday to Thursday overnight fee is 1 day of interest daily, and 3 days of overnight fee to be charge on Friday. Crypto-Currency is subjected to 3 days of overnight fee on Thursday.