Travelers returning from foreign trips has to surrender the unspent for foreign currency notes within 180 days of return.
On return from a foreign travel, travelers are required to surrender unspent foreign exchange held in the form of currency notes within 180 days of return. However, they are free to retain foreign exchange up to USD 2,000, in the form of foreign currency notes for future use or credit to their Resident Foreign Currency (Domestic) [RFC (Domestic)] Accounts.