No, your friend doesn’t have to start over. Read the FARs carefully. There is a provision that allows you to count any instruction time by a foreign instructor as long as they are licensed in a member country of ICAO or a foreign military and that the training was conducted outside of the USA. Also, he will keep his certificate number.<div><br></div><div>All of the flight time in foreign countries shall count as long as they meet the wording in the FARs.</div>