GT5 Prologue has taken roughly 3 years and 320,000 man-hours to get this far, creator and producer of the Gran Turismo series, Kazunori Yamauchi has said. He said they have 120 people working on the game 40 of whom are car modelers. In the first Gran Turismo, one car model took an average of one day to create, where now it takes them 180 days to do one car. In GT4 they used 4000 to 5000 polygons to create a car, in GT5 the number rises to 200,000. Yamauchi's interest in cars started when he was around 4, but he didn't get his drivers license until the age of 24 because of the expense in Japan. He currently owns a Nissan 350Z, Honda S2000, Mercedes-Benz SL55 AMG, Porsche 996 GT3 and two Ford GTs.