Originally Posted by psylockolussus
Yes I doubt it was just 2 weeks. Even if they used a lot of body stunts for Magneto, I don't think they could have filmed all scenes for Ian McKellen in just 2 weeks especially if it was for a high-budgeted movie.
He was busy with LotR. They had to move things around to fit his schedule. He filmed his entire role in 2 weeks.