If 당신 mean SCREAM 4... SCREAM 3 was released in 1999 또는 something, so it can't be 더 많이 than 12 years. But I seriously doubt Kevin Williamson started to plan a fourth immediately after, so... I'd say much less than 12 years.
As for the original SCREAM, I don't think there's any official information on that, so I don't know where did 당신 get those numbers?
Scream was made in '96. Scream 2 was made in '97. Scream 3 was made in '00. Scream 4 was made in '11. I know how long it took to make 2, 3, and 4. But I don't know how long it took to make 1.
