Shah Rukh Khan says enacting a double role of a superstar and his young admirer in his upcoming film Fan was physically quite challenging for him. In the film, to be released in April this year, Shah Rukh plays Aryan Khanna and his lookalike fan Gaurav Chanana. Shah Rukh revealed that he had to work hard on his look while getting into the skin of Gaurav???s character. ???We had to put make-up and initially it used to take six hours. Later, after some practice, it took two-and-half to three hours,??? he said.