It took about 4 years to make the FF7.

Updateing graphics isn't an easy task becuase with the updated graphics will also have to re program the intire game. I could take 7 years to make a "close to perfect" remake. They could just slap better graphics on it and have it out in 3 years but if they are going to remake this game they are going to make it as good as humanly possable.